Damn, alright. I'm down. I'm not sure how far you mean "know how your mac works" tho. As for unren, I haven't tried getting it to work yet. I've always been meaning to, but haven't put in effort in going down that rabbit hole. I do have and use rpatools tho.
Alright, so here's the deal. Prime's mod version of the game doesn't have any of the .rpy files uncompiled. The cheat injector needs the .rpy version to work. So that means you need to decompile .rpyc files into the .rpy version. And for that, you need unren or unrpyc (unren just downloads and uses unrpyc). And for all of that, you need to modify the game files. Which, in a mac, means you'll need to get into a .pkg file.
So, in mac's, rather than a zip file or a folder, for convenience of the user, all programs and its files are bundled into a .pkg file. But the .pkg file is just another zip format (7zip, I believe) file renamed to .pkg. So the first thing you'll need to do is get into it or unzip it so you can get to the files. It's been more than 2 decades since I've had to do that so I don't remember the exact steps. Please look online for that part.
Once you have access to the files to modify them (just peeking into the .pkg file doesn't work), you'll need to find the archive.rpa file (which, I believe is in the contents folder somewhere.). That needs to be extracted. This can be done with unren or rpatool. As you probably know, rpatool -x ./archive.rpa will do that just fine.
Once that's extracted, there will be a lot of .rpyc files. These are the compiled files I was talking about. They need to be decompiled into .rpy files. Use either unren or unrpyc to do that. You'll need to, at least, decompile options.rpyc, screens.rpyc and Prime_mod_1.4e_Megatron.rpy. The easiest way to do this is simple to have unrpyc decompile everything on game run. You can read about how to do that
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So, with all that done, you're ready to run my script
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. The script was designed for linux and not mac so it'll try to use wget, which doesn't have wget. So the first thing you'll need to do is make it so that it skips the download rpatool step. You can do that simply by making sure rpatool exists in the same directory as the archive.rpa file. Once all that is in place, you can download the script, place it into the folder named "game" (which is where the archive.rpa is) and run it via a terminal. It'll then modify the options.rpy file and the Prime_mod_1.4e_Megatron.rpy file. Once all that is done, you're done. Run the game