You don’t even have to patch it, creating a subreddit is all you need to do.
Can you elaborate on creating a subreddit to keep Boost working? Really do no want to uninstall it.
The API is still fully functional for moderator accounts, including NSFW posts if you’re moderating an NSFW subreddit. So, you can create a subreddit, mark it as NSFW, set it to private if you wish, and have a fully functioning Boost app again. This trick probably won’t work forever, but enjoy it while it lasts.
I personally found Boost to be faster when using my own API key with ReVanced, so that might be the better option(unless being a mod somehow speeds it up)
As a mod, I haven’t noticed any difference in speed before and after API changes.