That's exactly what I'm doing since I'll have to test the new stuff for the both paths, so in theory if you play the Familiar Face quest now and leave "The Naughty Sibling" on the step where you have to choose which twin to go for (going to Mia and Lia's cabin at early night), you'll be playing the most tested scenario
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Also on future stuff - I can't promise anything on that. The truth is that I have the main story plotted out and it doesn't rely on either Mia or Lia, seeing that they are the least favored characters (don't ask why - they would be in the top five if I got to vote on future quests). Every couple of months or so I'm going to include one step of the main story to the Patreon vote and this will (usually) be the choice of my patreons. The rest are sort of side-quests which I write on the go depending on loose ends left by other side quests and/or the main story. Would my patreons vote for Mia and/or Lia in those polls is not something that's in my control. I think it's fair for me to keep control of the main story while my patreons get to choose who they like to see in the next version. Some of us like shy teens, some like slutty ones, some like MILFs, some like redheads, some - blondes, some like big boobs, some are into small perky tits and some may be into something else so I try to mix those when making the polls, but my patreons are as important for this game to be finished as I am, so I want to respect their choice.