SRU: On the other hand to seemingly satisfy Geany's Developers current requirements, E: I don't understand what you mean by that. My response: You have essentially told me to upgrade to Debian 64-bit and 32-bit OS's are not supported by Geany's Development team.
The Python callable C compiler that seemed promising is: SCons is an Open Source software construction tool which orchestrates the construction of software (and other tangible products such as documentation files) by determining which component pieces must be built or rebuilt and invoking the necessary commands to build them. ref. https://pypi.org/project/SCons/
I'm leaving the issue open because you have not resolved allowing 32-bit OS's to be currently supported by Geany 1.38.