Thanks for sharing your constraints. Make sense as to why you can’t use Fusion or AI as suggested.
While it sounds like you have a solution, FWIW, you can self-host a Github repo as well as a standard or coding AI and agentic coding fairly easily these days with the various recipes that are available. Setting those up would still probably be less work than having to comb through lots of code by yourself…you may find there are other uses for a self-hosted AI to expedite your work…