I did changes to your unity engine integration, now is not finished by me yet, I'll add a bit later:

1. CI/CD (gh actions) pipeline so we could add unitypackage to a releases automatically.
2. I'll research about how to publish bitmono unity integration to Unity assets Store.
3. (?) Maybe NuGet package with unity integration, as I remember there's a way to use nuget packages in Unity, idk if this will make obfuscator to work too, need to test.
4. Need to add docs on all of that, how to use this all, how to test, etc.

Further testing required, but for me it works nicely. IL2CPP #250 is probably going to be added later, as I researched this is not related to how BitMono protects the file, but instead is about editing the IL2CPP C++ source code files.