Unless you have a lot of space on your bow roller(s) you are going to have to forgo the joys of swinging moorings. The answer is exercise to promote core stability and muscle strength - otherwise you need 2 anchor winches so you have back-up (yea, I meant that one!) for the inevitable failure.
(This is also, at least in part, to assist the OP who probably thinks we aren't being very helpful.)
While I understand the point, there is, I feel, a compromise possible. When my windlass (a SL horizontal axis spur geared "Horizon" model - but exactly which I can't remember - suffered its first "inevitable failure", part of the restorative action involved buying an emergency retrieval handle which screws on to the barrel and is ratcheted so that with the electrics dead the rode can still be cranked in manually. Slower, but certainly less strain on the back than heave ho. While SL are, alas, no more, I obtained the handle from the man in Paisley who has access to their spares. (Search for previous references.) It wasn't cheap, but IMHO well worthwhile. In buying another windlass I would make sure that some such arrangement was possible. I believe that vertical axis machines have a standard winch handle socket for this, but have no personal experience.