I forget which ones but some of these had very good red response IIRC. I tried buying some years back but got nothing but ping ponged back and forth.
I'm not sure about cutting this stuff to 35mm. It was sold in 70mm 5 and I think 10"? Something like that. Isn't 35mm different base etc?
While 35mm may have a different base thickness in general specifications, I see no reason why other base thickness (thinner) wouldn't work just fine. After all, the pressure plate on a 35mm camera is spring-loaded and would still hold the film flat. At one time Ilford marketed a thinner base film that gave you 72 exposures per roll. Remember that?