yes i use hekate with atmosphere, ok i will figure out on hekate, maybe there is simple code to trigger boot on stock ofwDepends on what CFW/bootloader you use, and what you define as stock.
If you mean stock, as in hekates stock mode, with only the cfw elements needed to be able to boot, its possible, by adding an entry to your hekate config and telling fastCFWswitch to boot it.
If you mean stock, as in no custom code runs, and it boots normaly, I don't think there is a simple way out there.