Table 4.1
All except CJP's on TYK's.
And there are notes for the PJP TYK's.
I don't see where the qualification text addresses the ceramic backing explicitly in the context of qualfication.
But Section 5.10 says roots may be backed by,,,,,,,,,,,,,
So initially I would have to say the answer to your question, with the note proviso's I posted, is yes.
Given of course your one sided CJP qual test without backing or backgouging as you mentioned.