Good luck finding them in your size, and no you should not run a smaller side wall. It will look dumb and handle worse and also mess up the speedo.
I know of only a few tires that have white letters on them.
BFG makes the Radial T/A, they a popular with older muscle cars.
Firestone makes the INDY 500 tires with raised white letters.
And I think Goodyear makes a Eagle GT tire with raised white letters.
ebay sells this white paint I have used it but would never use it again followed all the instructions to the letter then about 4 weeks later it turned brown tried bleach and it would not whiten, only thing to do is repaint it every 4 weeks and he sayd this is the ast month selling on ebay next month it will only be available in Florida. He had that on there when I bought it 3 years agao
White Wall Tire Paint Super Flex No Cracking Whitewall Classic 8 0z Tyre GL | eBay