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Late to the discussion (and in no way a knife expert) but someone mentioned Spyderco a few pages back and I am happy with their “UK penknife” model that they designed to be UK EDC legal (though I know that’s not relevant to you). It folds and can easily be opened one handed but it doesn’t technically lock - it just has a pressure bar that gives it a click/notch that you have to overcome. It’s a neat design. Solid, light, plenty sharp enough (for me certainly).
Just watched this
https://youtu.be/_lbtr9O6G_Y
It looks like a really good option. Well designed, can be used with gloves. Plus it's inexpensive, and the non-serrated half looks to be a reasonable length.
Very much personal opinion and all, but based on your brief I wouldn't go opinel nor fixed blade.