Is there yet such a thing as a CRI(HPCA) rating?
No! Its an unnecessary and totally confusing concoction to provide a way to authorise a limited number of TRIs so that they can instruct on HPSPA. Logically, you would simply call them TRI(SPA) which is what they will be after April 2012.
Instead of adopting a simple logical approach to change, the CAA seem to be intent on making it as difficult and complicated as possible.
The only difference between a UK and a JAA licence is 3 words on the cover, presumably, those 3 words will be the only thing that change on a Part-FCL Licence, so a simple sticker would solve their licence conversion problem