If I ever find myself in this situation I'll spend my last minute poking holes in one side of my body so that every time I get closer to the sun and start to off gas I spin just a little bit faster.

That sounds about right. No decay in the traditional sense, hard vacuum in unfiltered sunlight is going to be a pretty great sterilization method. You'll offgas almost all of your water over time, so you'll be a spooky mummy at least.

Over time the raw power of the sun and random cosmic ray will "decay" you via splitting apart your component molecules, but i dont know if thats enough to truely poof you away or just make you a very bleached mummy.

Not decay as they would be frozen, obviously.

Sublimation. As long as it gets energy from radiation some atoms or molecules would randomy get enough to f off into space. In my theory, at least. And bones would stay last as they are the hardest.

Sublimation happens all the time. I got that from AlphaPhoenix on youtube https://www.youtube.com/watch?v=bnqQyeqGIBE Really cool science channel