Re:
I've used Starchem SynStryp Paint Stripper on a host of different things including a Hammerite painted frame. It really does just bubble the paint up and off in a couple of minutes.
Whether the general public should be able to get hold of it is a different question, but you can get via Amazon and ebay without any problems.
Follow the instructions about safety and wot not and you should be alright.
I do it outside, wear goggles, gauntlets, a mask and stand upwind while applying it and walk away from the area while it does it stuff. Once it's removed I wash down the parts and dry them. I then just bag them until it's time to repaint.