Well you could always try something like the using each standalone as a window in time. You can then choose to go either forward or back from there thus missing out a lot of the background setting. I mean JW is doing basically this in S8.

I would tend to complete the fics as you envisioned them and put the other ideas into a sequel. Otherwise you end up with an epic. Not that that's a bad thing but of course it would mean putting other things on the back burner.

The only issue with this is prequilitus whether readers will read something set before the end you have already written , whether the drama is gone, the only thing here is the time gap. If it is long enough you have enough wriggle room. Seen this done a number of times like Nemo's partners series & Bastard snows Coffee series, the thing to remember here is later readers will start at the beginning.

Or you could cheat like I am and try both.