basically if you add 1" of lip (25.4mm) you half that and add it to the offset.
if its a increase in barrel size its the opposite. (deduct half whatever was added from the offset)
so your 15x6.5et33(0.5" lips) becomes 15x7et21-22(1"lip) as you said before.
As to honda fitment I have no idea. the Jazz is a mates car and iv never really paid much attention to what does/doesnt work on it lol
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