I know a guy in Australia who makes really nice celtic jewellery, including pewter stuff.
I have asked him if he makes kilt pins, he said no, should I ask if he is willing to custom make one?

Can we guarantee an order?

Here is his work: http://www.celticmotifs.com.au/

actually, what about his brooches? would they make a good kilt pin?
http://www.celticmotifs.com.au/brooches.htm