@onpaperwings I did a conference talk about this topic a month or so ago. The best utility I found for self-republishing is one that re-processes your official "account backup" to static files (like decoding internal IDs to account names), but even then I found that thoughtful post-processing was needed to make the result usable for the real world (e.g., to search or to be able to find the archive for a given old tweet link). I could point you to the talk page if you cared.