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More ebay stuff:
New Black Hard Plastic DC Camera Belt Buckle Button O1A - eBay (item 260705474806 end time Jan-07-11 19:38:24 PST)
I suppose the above could be combined with a strap and a 1/4" thread flash shoe adapter to get a similar thing to the one the OP was looking for. Also, these might be useful for the application:
Wireless Remote Flash Trigger w/ Umbrella Holder T1E - eBay (item 230382636338 end time Dec-22-10 18:46:23 PST)
(I have a set of the above and dispite the price they are working fine :-)