Seems buildable. Would you use it? The idea would be to have your Nostr npub contain all of your old tweets. Would not have the same likes etc, but the posts would be there in case you ever wanted to repost or link to them.  

 nostr:nevent1qqsz9he5cftrp2wv44gaeq0q4vnkp7rquxfr6gn3ycrtvzhkv0a5kmgpzemhxue69uhhyetvv9ujumt0wd68ytnsw43z7q3q0fu0hlkx3s4n4dsgfu0cpqephga4afr4qtzpz9vsyqf7vj88v2yqxpqqqqqqzqchan9 

 Aha yes, exactly this!