"ETA: I just saw this in a news post - https://archiveofourown.org/comments/612309727 - imported works do not merge with current works, so any works currently posted to the collection could potentially get doubled."

Sadness! :(

Ah well, I guess it's a tradeoff that would still be worth it. There's currently 37 works in the AO3 collection at https://archiveofourown.org/collections/DMHG_FIC_EXCHANGE, versus the 1,518 Journal Entries in https://dmhgficexchange.dreamwidth.org/. So, conservatively, probably over 1,000 stories? Duplicates of 37 stories, to archive 1,000+, seems like a worthy trade-off.

Side note, apparently there's a very active Dramione reddit? 18,000+ members....!?!

https://www.reddit.com/r/Dramione/