Multiple roms - stock TW and aosp like fusion? topic

So...my previous phone was motorola razr maxx xt910 with locked bootloader.
And there was nice app - bootmenumanager or safestrap, which allowed following:
have multiple virtual roms, and stock rom.
So when i had installed stock rom, with stock kernel i could also boot cm based rom which required own, cm kernel.
It was done by kexec.

Is it possible to have stock rom, with stock kernel, and as second system cm based, aosp rom like fusion or blisspop with own kernel witout needing to flash kernel on every boot?