Output Talkie to I2S channel rather than DAC (ESP32)

[104TMR]

Hi All,
I'm hoping to use Phil Schatzmann's AudioTools library to take the output from Talkie and direct to an A2DP device (Bluetooth speaker, etc) using an ESP32, compiling on Arduino (2.3.2) platform. It strikes me this could be done most efficiently if Talkie could output to an I2S channel, and then AudioTools directs that channel to Bluetooth.
Has anyone done this already, or any suggestions on how it could/should be done?
Any & all ideas appreciated.