Thanks for the kind posting. I'm glad not everybody is bored with this detailed engineering-work.
I think Borax would work fine. My reluctance in using is (1) it carries much water with it (10H2O IIRC), which would need to be steamed out of the concentrate, and (2) a greater quantity would be required to raise pH to the desired level, requiring that more concentrate be used per litre. I know it's difficult for relayer to find in Ukraine, but can't Europeans buy metaborate easily from the UK and Germany? For mixing directly into water, Borax dissolves slowly. So if metaborate is unavailable, I'd suggest trying TEA instead of Borax.
PG reduces pH slightly and slows development a bit. It can be omitted from direct-to-water brews by reducing development-time slightly.
Good point about T-grain films containing less silver. I'll do my capacity-tests using the brick of Tri-X I have in the freezer.
Originally Posted by Rudeofus