Well just ordered this in grey dial from Hont, he says he can get it. On further review it looks like MPF is using a 15400 case as there's a gap between the bezel and the adjacent case line, which is not present on the 15500 and 15510. The bezel screws seem slightly larger than gen but then I always thought ZF's bezel screws were a bit small, so neither are completely correct.
I'm going to try to swap in my ZF bracelet as long as the lug pins line up. Depending on that, the case thickness (I'd rather it be the thinner 9.8mm 15400 case vs the 10.6mm of my 15500 case), and how the case finishing is in general, I may attempt a case swap as well since I have the V2 with the same Miyota. The gen 15510 case and bracelet are shaped differently than both reps so no matter which case I keep it won't be completely accurate anyway.
Regardless, even with inaccuracies to gen, I still think it'll be an improvement in my eyes over the ZF 15500. The brownish plasticy dial with no sunburst is a letdown despite how nice the case and bracelet finishing is, and I think the 15510 is overall a design improvement on the 15500 and 15400 anyway. Swapping in this dial/Miyota into a ZF 15500 is probably the best we can get until ZF releases a 15510 with this dial, accurate case/bracelet, and clone A4302. Then of course they have had years to improve the 15400/15500 dials and ignored them at each new version, with only the 15400 white having any metallic sunburst.
As far as I know I'm the first here or on reddit to purchase this so I'll keep you all updated with QC and comparisons to my ZF 15500 grey dial when it eventually arrives.