From your post...
I wish to interact with microbloggers as a piefed user. Piefed could render microblog posts that contain a hashtag as a community post within a “community” named by this particular hashtag
That is literally how mbin does it!
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Ada
@ada@piefed.blahaj.zone
Post
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If you want to do this, Mbin can be a temporary solution, they support both format already -
If you want to do this, Mbin can be a temporary solution, they support both format already