In reply to Richard Baynes:
i don't think there's any reason why you can't break the head off and put it in with ordinary tins, is there? recycling the steel minces it up & melts it,; a bit of plastic would just burn off.
maybe a rolls razor? [might post some links later]. trickier than disposables, but not much.
the hot water for shaving can add up, especially if you leave the tap running!