Posted the blog post here: https://maxfierke.com/blog/posts/so-you-want-to-compile-crystal-on-arm64-macos
Tested it all this evening, and was able to get working shards, as well as another application compiled and running without making any changes to either of those.
I need to tweak the code blog styles on my blog a bit so that it’s not so ugly, but after that I’ll publish more broadly.