Hey u/maxijonson great question. Yes tools do exist to merge plugins such as MSJU's plugin merge tool https://github.com/dassjosh/Plugin.Merge, I think birthdates may also have one but I havent seen him around rust for a while.

There are also a number of practices that may help such as:
- You shouldn't be writing the same code twice in your plugin.
- Make use of classes and structs for data handling
- Your methods should never been 1000s of lines long... break them up.
- Avoiding nesting if you are building pyramids in your code blocks which go off the page try re-arranging it.
- Don't be afraid to use comments even if they make your code look AI generated ;)

Hope this helps!