Most 12" toilets would have 2.25" between the wall and tank with your 13.5" rough.
They do make 14" tanks for other brands that fill that space some, with out moving the bowl back.
Toto at least allows the bowl to move back 2".
Getting something in ADA in Sanagloss is hard, the Toto Soriee comes that way with the skirted base, which as you note would mean moving the supply if you move the bowl back with the 14" Unifit.
The Soriee has the 16.125" high bowl, elongated, Sanagloss, Cyclone flush, and a bigger cost added to it.
I'm waiting to install one in my home to try it out.
You can go without the Sanagloss, even the standard glaze is pretty good.