It would look stupid. The tires are the same height.

 

That will increase oversteer tendency and cause your traction control to kick in more often as you more easily overpower the rear tires. I assume you are keeping the wider wheel in the rear? And your tires have life left in them?

 

All seasons in hot areas is not advisable. Michelin comp a whole set on my lexus bc they had advised discount tire not to sell that model where I lived bc they had many consumers calling in about rapid dry rot causing tires to lose air. They have discount tire the ok to replace with pilot sports 4s