Not quite understand the rationale of new tyres rule? is that for safefy (i don't think so!) or just making the car look like Lopburi era (what for)?
problem is whether there're wheels that fit new tyres sizes? even if it does, how many people willing to cut / extend the body work of their beloved car..
for me, I support standard slick tyres if it's really cheap!
and recommend to increase safety standard rather than bigger tyres size.
No serious, it's just an hobby