Jon, sorry, looks like the people who really know their stuff have all signed off.
Look, installing Lazarus is a pretty easy process, right now you are suffering for running too many different install attempts. Like Handoko said, you need to remove the distractions !
Each of your attempts have probably left bit and pieces everywhere, I strongly suggest you make an effort to try and find those bits and remove them all and then, only when you are sure all the distractions are gone try one of the install methods again. Just one. Any one will work fine.
https://wiki.freepascal.org/Installing_Lazarus_on_macOS-- Discussion Mode, don't read if your head is spinning --
Personally, I have a FPC322 (322 is a good idea on the Mac) install and I build Lazarus from source. Lots of people seem to think thats hard but building apps is what FPC/Lazarus is all about ! Its one command line and running that command tests it all for you. Anyway, choose your model and stick with it ! 2.0.12 should be fine but Fixes 2.2 will have a few extra tweaks for the Mac.
Again. personally, I prefer an install where I know where everything actually is.
Good luck !
Davo