I haven't tried any of the recent Fuji CA materials at room temp.
Can you deal with rolls?
I'm cutting my own from Kodak Edge, which is cheap but thinner than Portra/Supra.
It gives good results at room temp with Kodak RA/RT with some experience.
edt, sorry see now that you don't necessarily need room temp
I've run some of the older... CA PIII I think it was. I only had a few sheets left over and it seem okay in the RA/RT at room temp