Hi Jane,
I haven't ever tried Maldon. I'll be on the lookout for it.
So many recipes call for Kosher. It's a challenge to know what to do in terms of amount since the Morton's and Diamond crystal give different amounts when measured in the same volume.
Up until now, I've always used Celtic Sea Salt because it tastes good and doesn't make me swell. When I eat out, and they use some other salt, I usually can bank on swelling afterwards...rings tighter, etc.
Since your Maldon is a sea salt, it would probably be ok.