You can think about 205/35-18 all you want, but that won't change the number of tires sold in that size at the Tire Rack: zero.
It's a really really really BAD IDEA to mount tires onto wheels that are wider than what's approved by the tire manufacturer. Stress and heat build up in the sidewalls, and this commonly leads to tire failure. Most 225/35-19 tires are not approved for mounting on 19x9.5 wheels.
On an NSX with 18"/19" wheels, stick with 215/35-18 and either 265/30-19 or 275/30-19 rears.