so if you lost your sxos pro dongle how can you get into sxos on your switch I remember reading somewhere you can use a pc or android device, wonder if someone can provide me a link
Download the SX Loader from sx.xecuter.com (your payload), then use NXLoader (Android) or TegraRCMSmash (Windows). There's a million tutorials on gbatemp on how to launch a payload.
You need any means of launching a payload. If you are able to launch hekate, then you are also able to launch SX OS. No need for a dongle, it's just convenient. But you still need to buy SX OS license of course.