diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0a42817e..2ba4ff38 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,11 +7,11 @@ workflows:
       - unit-test:
           matrix:
             parameters:
-              python-version: ["3.8", "3.9", "3.10"]
+              python-version: ["3.8", "3.9", "3.10", "3.11"]
       - integration-test:
           matrix:
             parameters:
-              python-version: ["3.8", "3.9", "3.10"]
+              python-version: ["3.8", "3.9", "3.10", "3.11"]
       - docset
 
 jobs:
diff --git a/.test-env b/.test-env
index df783a4f..9dfcb210 100644
--- a/.test-env
+++ b/.test-env
@@ -13,4 +13,47 @@ REMOVE_LOCAL_FEATURES=0
 
 # WARNING: Be careful when turning on the next variable.
 # In that case you'll need to provide all variables expected by `algorand-sdk-testing`'s `.env`
-OVERWRITE_TESTING_ENVIRONMENT=0
+OVERWRITE_TESTING_ENVIRONMENT=1
+
+# WARNING: THE FOLLOWING IS FOR LOCAL DEVELOPMENT ONLY
+# IF SET TO 1 AND PUSHED TO C.I., THE TEST WILL HANG AND FAIL.
+#
+# What can ease some of the pain above is to overwrite interactively:
+INTERACTIVE_TESTING_ENVIRONMENT=0
+
+
+## --- FOR OVERWRITE PURPOSES! DELETE ALL THE BELOW!!!!
+
+# Used to determine sandbox build type:
+TYPE=source # (previously `"channel"`) #  OR "source"
+
+
+# Used when TYPE==channel:
+ALGOD_CHANNEL="nightly"
+
+# Used when TYPE==source:
+ALGOD_URL=https://github.com/tzaffi/go-algorand # (previously `"https://github.com/algorand/go-algorand"`)
+ALGOD_BRANCH=improve-some-goal-errors # (previously `"master"`)
+ALGOD_SHA=""
+
+# Used regardless of TYPE:
+NETWORK_TEMPLATE="images/algod/DevModeNetwork.json"  # refers to the ./images directory in the sandbox repo
+NETWORK_NUM_ROUNDS=30000
+INDEXER_URL="https://github.com/algorand/indexer"
+NODE_ARCHIVAL="False"
+INDEXER_BRANCH="develop"
+INDEXER_SHA=""
+
+# Sandbox configuration:
+SANDBOX_URL="https://github.com/algorand/sandbox"
+SANDBOX_BRANCH="master"
+LOCAL_SANDBOX_DIR=".sandbox"
+
+# replacement values for Sandbox's docker-compose:
+ALGOD_CONTAINER=sdk-harness-algod
+KMD_PORT=60001
+ALGOD_PORT=60000
+INDEXER_CONTAINER=sdk-harness-indexer
+INDEXER_PORT=59999
+POSTGRES_CONTAINER=sdk-harness-postgres
+POSTGRES_PORT=65432
diff --git a/harness_overwrite.py b/harness_overwrite.py
new file mode 100644
index 00000000..5677cd17
--- /dev/null
+++ b/harness_overwrite.py
@@ -0,0 +1,91 @@
+import sys
+from typing import Dict, Optional, Tuple
+
+
+def get_env(line: str) -> Optional[Tuple[str, str, str]]:
+    if line and line[0] not in (" ", "#") and "=" in line:
+        key, others = line.split("=", maxsplit=1)
+        key = key.strip()
+        if "#" in others:
+            val, extra = others.split("#", maxsplit=1)
+            val = val.strip()
+        else:
+            val, extra = others.strip(), ""
+        return key, val, extra
+
+
+def manualy_parse(env_file: str) -> Dict[str, str]:
+    env = {}
+    with open(env_file) as f:
+        for line in f.readlines():
+            if e := get_env(line):
+                key, val, _ = e
+                env[key] = val
+    return env
+
+
+def overwrite(env_file: str, new_env: Dict[str, str]) -> None:
+    with open(env_file, "r+") as f:
+        lines = f.readlines()
+        for i, line in enumerate(lines):
+            if e := get_env(line):
+                key, old_val, extra = e
+                if key in new_env and (val := new_env[key]) != old_val:
+                    lines[i] = (
+                        f"{key}={val} # (previously `{old_val}`)"
+                        + (f" # {extra}" if extra else "")
+                        + "\n"
+                    )
+
+        f.seek(0)
+        f.writelines(lines)
+        f.truncate()
+
+
+def get_rewrites(
+    env: Dict[str, str], key_filter: Optional[str] = None
+) -> Dict[str, str]:
+    keys = key_filter.split(",") if key_filter else None
+    return {
+        k: w
+        for k, v in env.items()
+        if (not keys or k in keys)
+        and (w := input(f"{k} (default `{v}`):").strip())
+        and w != v
+    }
+
+
+def get_keys(env: Dict[str, str]) -> Optional[str]:
+    print(
+        f"""Which of the following env vars do you want to modify?
+
+{",".join(env.keys())}
+
+    (skip for ALL, or provide comma separated)
+    
+    A typical choice is:
+TYPE,ALGOD_URL,ALGOD_BRANCH
+"""
+    )
+    return input("CHOICES:\n").strip()
+
+
+def go():
+    env_file = sys.argv[1]
+    env = manualy_parse(env_file)
+    print("_" * 50)
+    keys = get_keys(env)
+    print("_" * 50)
+    print("Please provide env variable overrides (skip to keep defaults)")
+    new_env = get_rewrites(env, key_filter=keys)
+
+    print("_" * 50)
+    print("OVERWRITING")
+    for k, v in new_env.items():
+        print(f"new_env[{k}]={v} (PREVIOUS: env[{k}]={env[k]})")
+
+    overwrite(env_file, new_env)
+    print("_" * 50)
+
+
+go()
diff --git a/test-harness.sh b/test-harness.sh
index 7e1a4f75..91c4fdca 100755
--- a/test-harness.sh
+++ b/test-harness.sh
@@ -84,6 +84,12 @@ if [[ $OVERWRITE_TESTING_ENVIRONMENT == 1 ]]; then
   cp "$ENV_FILE" "$SDK_TESTING_HARNESS"/.env
 fi
 
+# **** BEGIN PYTHON ONLY **** #
+echo "$THIS: INTERACTIVE_TESTING_ENVIRONMENT=$INTERACTIVE_TESTING_ENVIRONMENT"
+if [[ $INTERACTIVE_TESTING_ENVIRONMENT == 1 ]]; then
+  python harness_overwrite.py "$SDK_TESTING_HARNESS"/.env
+fi
+# **** END PYTHON ONLY **** #
 
 echo "$THIS: REMOVE_LOCAL_FEATURES=$REMOVE_LOCAL_FEATURES"
 ## Copy feature files into the project resources