Brook is tough to treat; you have to be fast, the fish have to be in good condition, you need just the right treatment, and have some luck as well.
Raising the temp won't help much, if at all, unless you go high enough to be fatal to various pathogens. Bleaching works at 400 ppm, but you would essentially be starting over, and that takes time as well. Freshwater is easier to do than bleach (no rinsing) but not as effective at getting into the interstices of the LR. I'd leave the tank fallow. If you are going to mix fish and inverts, then perhaps you could acquire some shrimp, etc. to give yourself something to watch during that time?
Jay