You probably DO NOT want to use an increase in tire size to gain ground clearance.
The first problem is that you’ll throw your speedometer, and your transmission shifts, off. You say you can live with the first, but the second may be a problem. The second is that constant scraping is usually a sign of some other problem such as misaligned exhaust parts or sagging or broken springs.
The H and V rating tires will give you less wear, and are less resistant to curb and other impact damage, and you can stiffen your sidewalls by simply increasing your inflation pressure.
If it were my car I’d first make sure that the exhaust system is not hanging abnormally low. I’d then measure the distance between the bottom of the rocker panel and the ground and compare it to a comparable Toyota or two to see if I have abnormally low clearance due to heavy loads, sagging springs, or replacement of the factory springs with lowering springs by a previous owner.
If you find a problem, you can correct it without fooling around with the tires and wheels. Your Toyota is new enough that coil springs are readily available.
If results to this point are negative, you may be able to increase ride height by going to monotube gas pressure struts (like Bilstein) or changing your coils to variable rate springs with a higher capacity than your current springs.
Finally, there are both air supports and helper springs out there that can boost car clearance.
Any of those approaches would be preferable to tinkering with tire and wheel assembly diameter.
