Not sure I totally understand your goal. You want to go to 20" wheels to go up in tire width?
I just went from stock 788m wheels to apex EC-7 which are a half inch wider and put 265/30/19 front - 295/30/19 PS4S
Spend some time on the wheel threads and read the research people have put into it. The setup I chose has the closes to stock rolling diameter while maximizing tire sizes.
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