To fix the crawling, I'm going to need to start using Twitter accounts to fetch new posts. This is getting complicated for the time I can put on this as a side project, so I'm going to rely on Nitter implementing this, then I'm going to use that. You can track progress here: https://github.com/zedeus/nitter/issues/983
There is another thing I can fix natively in bird.makeup though. I noticed pinned tweets are there in user lookups. I can forward this, and the top 100 limitation doesn't apply to that.