Over on CN this business has been mentioned as a good DSLR conversion provider:
http://www.lifepixel.com/shop
They appear to do Full Spectrum and Ha conversions, as well as IR and other services. I have emailed them to see if they do mono conversions (debayering), as well.
They are mail order only, but you seem to set it all up through their shop.
No cooling mentioned, and its a long way for send your camera, and it's not as cheap as Whilton in Sydney for a simple filter removal. Will report back when I hear more.