Process for distilling

As a work around - to transfer out of the “brewing” system into multiple vessels we have a “Dummy” (fictitious) vessel set up in breww with a volume larger than the sum of the (in our case 2) actual vessels we’ll be transferring into.

(as suggested here: How to transfer a single turn batch into multiple fermenters - Help docs & tutorials / Production - Breww Community)
So,
Transfer Turn 1 from Brewhouse to DUMMY.
Then,
Transfer (some volume) from DUMMY to FV 1.
and
Transfer (the rest) from DUMMY to FV 2.

I suspect you can manage your abv / dilution thing with “calculated fields”. You’d need to tag the starting abv & added volume in your recipe. Then enter the appropriate formula somewhere.