The answer to 1 and 2 should be yes, is my understanding. Are you able to build to MacOS with IAP? Many users have mentioned problems when trying to compile with IL2CPP on MacOS, and we are working on an update.
Sorry, I’m not familiar with the Social APIs, I support Analytics and IAP. Are you having compile issues on MacOS also? Would be good to confirm first. To your question, the release may be a couple of months out.