The custom engravings are always sent out individually anyway.
I can organise it for you or i can give you the email of the guy who does it. Its just a replacement panel

- (rather than the one that comes with the kit being engraved, so no time limit. Ive sat on it for about 5 months).
You'd need a black and white (not greyscale) image, square, and at least 300dpi. I cant remember all the formats but TIF and EPS are definitely compatible. You can also get additional holes cut if you want but its quite a tight fit inside
If you want to email me or PM your image with your contact's postage address i will get it sorted

Or if you'd prefer to deal direct with the engraver PM me and ill give you his email address.
Cheers
Ben