Skip more frames than 99 and higher frame rate than 999?

I'm working on an insane comp that's intentionally slowmo for 3 hours with many neseted comps, it would be nice to not have to context-shift into a top level time-remapped comp that's only used to preview the inner comp at a much higher framerate/skipped frames. Plus, I assume time-remap encours some cost in preview rendering. 

My comp's animated motion is so slow, in order to get the big picture, I need to constantly preview at super high skip. That requires constant switching to the containing comp, and that switch makes the Adobe Cache DB churn for a while instead of just hitting the RAM/cache drive instantly. Feels very sluggish compared to just hitting preview.