Hi,
Trophy shops can't do this sort of thing for a few reasons, it'll need doing buy hand.
It seems hand engraving is a hard thing to find these days.
I've only managed to find one person so far in the US at a quote of $200 :-0

I think I need to keep looking :-)
Must be somebody in the UK in a shed happy to do it for a reasonable cost.
Looks like I have hours more time searching the pages of FB