Couple (3) options that wouldn't bother me either way. I don't think any of us could throw a dart at it any better and don't foresee any complaints. Atleast the major names...Lefty, Rahm, Koepka, etc., would still prob be A's. Some would not. And so forth. Most obviously cannot slot below an A or B regardless. I'm cool with however you decide to slot them. It'll be no easier a toruney to get lucky on picks than any other.
1. Last posted OWGR
2. Best guess at where they'd be slotted today if getting credit (A-D pick)
3. List LIV spearately and allow them to be used as A or B picks collectively. So, A person could have A, LIV, C, D or LIV, LIV, C, D...etc. Would be nothing short of interesting however you slot them. If a LIV golfer has a green jacket and you pick them, it must be as an A.