Aircraft stripper works pretty well. Nothing short of dipping works very well. Keep in mind it's more plastic than paint. It tends to be not very cost effective to hire it sandblasted. Sandblasters hate powder coatings. If you blast yourself, it will take extra time and extra sand, it will come off. If you blast it yourself, I'd try to use a flapwheel first. At least get the layer of coating a little thinner to help with the blasting.
Powder coating requires good clean prep and off gassing of some metals. Like painting, good prep is the key.I've never powder coated anything. There were times that was the best option but I always think about it peeling off later. I'd rather re-finish something again than deal with that. It's just a personal preference though. Also I don't have a powder coating setup and I do my own refinishing. No jobbing anything out.
Klean-Strip makes a product call Aircraft stripper, that's the best. There are a few similar products. You can find them at an auto parts store normally.