You dont even have to do that, pretty much any company that makes pistons for the VE can make you custom 88mm pistons, how do you think everyone got 90 and 92mm pistons done. They didnt send in a head. They took what they knew and made the pistons to match the bore and did what they had to do to the dome to make the compression ratio come out right. Simple math and software.
There are no off the shelf HC 88mm pistons but they can do custom ones for roughly 100 bucks more than the off the shelf ones. No big deal.