Yes, too many say things are impossible.
It's just curiosity - I'm not having a go at you for being secretive - though you'd have Every right to be so. You've enough on your hands, and have shown an enormous amount of your work.
When I see the injectors into the rearward of the transfers (3? - I don't know the configuration. of the YZ barrel, just thinking of the most common transfer set up) I think of the shrouding that it might create if the transfer splitters are there still (goodness only knows) as std, or if a long extension of the injector is used to get the charge point out of the one transfer, into the crank / lower case area, thence it doing the 'usual' routing of the charge. Then thinking perhaps, you are locating the main charge in the rear transfers, using that shrouding, to have the forward transfers predominantly as an 'air' charge to block the fuel charge from exiting the exhaust, like a version of AST.
Yep, my imagination can go wild.................
Cripes, you're brave if you are going to try to run with no premix (re oil metering), although I think you are doing the oil metering to the mains / big end (little end?) Then using a Very Lean premix to lubricate the piston /rings / barrel (little end?)
?
Just rapt at your efforts, fascinated by what you're doing, yourself. Not getting others to do things for you, and just doing a Cad Drawing and dimensions. A Doer, as I said.
Geez I Hate praising Kiwis, they're a 'Orrible mob of bastards...................
somethings gone 'wrong' with me, I'm finding that funny little comedienne, Cal Wilson, quite attractive, nowadays............ I'll be deported soon, for being too tolerant / fond of Un Zudders.