I haven't, though I want one of those sets!
Hello Panos.I haven't seen this figure in keychain. Here is a link with all the keychains that I know.http://www.justforklicks.com/j4k/keychains.htmlFriendly Gerorge.
The head had a part for a screw or something, I think... I believe later they were all full (as oposed to the usual airheads ), but not sure on that.