you can open multiple instances of AE by changing the properties of the shortcut.
there you add to "TARGET" (SPACE) -m
like this:
"C:\Program Files\Adobe\Adobe After Effects CC\Support Files\AfterFX.exe" -m
I use that feature all the time in my workplace since the projects are small and not heavy
and I don't want to quit my current project just to quickly fix another.
about stabilization how about doing that in MOCHA?Â
if you enable cache clip in the preferences you should be able to get fast results in the processing stage.