Now there's another cracking idea, thanks
As it happens I have access to a 30cfm (approx) three phase compressor at work - not sure if there is an air sander around or not, but I'll have a look....
Otherwise I will probably end up trying the sander I have using the electrical safety equivalent of "squinting while angle grinding to save going to get the goggles". Although one problem is that I can't find any scourers that are big enough to cover the whole flat thingy (tech term) on the sander.
So if I disappear without trace leaving a half orange boat you'll know what happened