I came across this again, while looking for another post so bump.
I’m actually not against the beginnings of fuseki on OJE. For instance, joseki in the context of a fuseki are quite interesting. Like 3-4 approach moves in the Chinese and Kobayashi openings are interesting, or some of the ways to play against sanrensei etc.
If they are added, my suggestion would be it is just the first 5-6 moves of the fuseki - enough to get to the point where it has been named (Sanrensei, low/high/mini/micro Chinese, kobayashi, etc… maybe even historic Shusaku?)
Then after the first 5 or 6 moves, the approach move/invasion etc that starts a joseki links to the position where it is already in the database, but not as part of a fuseki. So what I mean would be, say you approach the corner in Sanrensei, and a pincer is common, it just links to that pincer joseki without the whole board stones. That way it would minimize the amount of overlap/re-inputting of joseki, but still would link certain joseki to certain fuseki.