I tried those Hayashis on a KE20 with 175/70 on them
They fit perfect on the rear with a small slip on spacer (8mm)
On the front they were flush with no spacer.
So really you could go to a 6 inch with o offset on the rear and a +8 at the front, or just use slip on spacer like I did.
I'm going to run a 7 -1 offset, which by my calculations will fit well with a bit of a roll and pull of guards. KE20's have that natural lip on the guards all round which could be rolled nicely and still look kind of factory