We've considered this question for Abracadabra repeatedly. She currently has a pressurized alcohol stove which we've no yet lit and likely never will. (While we were still debating rebuilding it and lighting it up, temporary slip neighbours that had been cruising for 27 years: "Oh, don't worry about it. We used ours for over 20 years and only ever had three flare-ups. Only one of them almost caught the boat afire." Meanwhile his wife is standing behind him shaking her head emphatically. That decided us.)
We certainly don't want to be hanging propane bottles off the stern rail and have hose running from there to the galley. There is a place we could have a vented propane locker installed, and it wouldn't even take away any currently-used space. It would require probably very expensive glass work, tho. It would be neat, but probably ain't gonna happen.
So we'll probably eventually swap the pressurized alcohol stove out for a non-pressurized alcohol stove, either an Origo or Cookmate.