phranque - 11:25 am on Mar 9, 2013 (gmt 0)
welcome to WebmasterWorld, Jerome!
you can set an arbitrary header in a FilesMatch or similar container if that would be sufficient to identify the requested resource(s) that are generating 410 responses.
while technically possible, you should answer lucy24's question before pursuing this.
a 410 will remove a url from the index.
(I'm assuming that's the purpose of the X-Robots-Tag)
how is the 410 being generated?