Not sure you will find something that small commercially, Maybe Dubro makes something for wings or hatches?
Found a Dubro Hatch Latch #DU-925
https://www.dubro.com/collections/building-supplies/products/hatch-latch?_pos=1&_sid=d224d92e7&_ss=r Maybe there is a UK supplier?
I sort of built my own in brass using tubes and pins, or plate.
One was for connecting the 9mm fire monitor in place. The second is for the
spring loaded hatch on the deck of my tug to allow cooling air into the hull.
I would imagine that soldering a bit of plate onto the end of a tube and then threading
a screw or socket head into the tube through the deck would create what you need.
Spring loading it, so it might press in to slip over and latch behind a pin would keep it from vibrating loose.
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