Here’s the guide that I used. I’m also using a modded version of Sync Pro from mobilism, worked just fine in the Revanced patcher and let’s you use Pro without crashing.
It’s the Change Oauth Client ID patch, but there’s some other stuff you have to setup for it to actually work. Here’s the guide that I used.
The current workaround is to become a moderator. Just create your own subreddit and that should potentially give you access to nsfw. Maybe also set the sub to nsfw for good measure.