Sure, I develop at 75F (24C) all the time. Hutchings mentions that you can go as high as 80F in his "Book of Pyro." Any highr than that and the film will swell up and even reticulate (grain becomes clumpy). I'm assuming, of course, that you mean Pyrogallol and not Pyrocatechin when you say "Pyro." I've used PMK (pyrogallol based) but have never tried any pyrocatechin type devs. The liquid PMK dev kit from Photographer's Formulary makes it really easy to mix and use.