Some swivels had a bad rap in the past so don’t buy a used one :) How about a Miflex hose from XSscuba, they have more give to them without the extra service issues of a swivel.
The other option is a long hose (7’) that goes around your body and then to your first. It doesn’t push the reg like a normal hose and if you ever need to donate to another diver it alows them to swim beside you rather than the usual face to face sharing which can’t be done in a wreck or swim thru.