Thanks again to everyone for your help and insights. I followed up with the shop on a few things:
Since the zone kit comes with a T-case drop already and there's an additional line item for a 1.5" drop kit, asked why. That seems like a LOT of drop and really don't want to lose that much clearance. Asked to get a second quote for the 4.25" kit instead, in which case I'd install the MML and just hang on to the body lift that it comes with. Or at the very least, want to have them double check that the 1.5" of T-case drop is necessary.
Asked that they correct the shocks to be 55239/55241
Since I'm still wondering if 2" is the simplest way for me to go with my 31's, asked them to supply another quote for if I were to piece it together. Know that that can be hairy due to current supply issues but hey, maybe they'll humor me. And then I could avoid the t-case issue altogether, or at the very least, get away with a few washers and call it a day.
Rancho 55128/55240
Pro comp or BDS 2" springs, whatever's available.
And whatever rear trackbar bracket is available.
Will follow up with how it goes.