I'd just touch it up on a stone if it's getting blunt, and then strop on cardboard as
@HumbleHomeCook said ^. I always strop any knife on cardboard anyway tbh.
It's probably not something to overthink. They're not massively expensive, and you could sharpen one on a paving slab and get it very useably sharp.
(I know people joke about paving slabs, but frankly you can sharpen a knife on just about any stone you ever find, paving slabs are just quite coarse usually. Though I've made some very good whetstones out of slate paving, and there are villages in the UK where paving is made out of Charnley, Idwal or Melynllyn stone. So don't write it off eh!)