I dunno. I wouldn't do it myself, so I say go for it.
Srly, Loovul has a major cancer charity ride each September, and they manage to get very unathletic people to go that far...over two days, and with a few months of training, and an incredible support staff, and free stuff from the Amgen warehouse about three miles from here.
I was kidding about the last part, although the Amgen warehouse really is that close to my house.
I'm thinking like an American, but from a liability standpoint you'd be royally hosed if anyone got hurt.
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Momento mori, amor fati.