Will a SIP proxy break res_phoneprov in Asterisk 12

I’m in the process of porting an older setup (1.8 ) to 12. I’m exploring alternatives to the normal method of provisioning (phones directly connecting to a FTP maintaining lots of configs). I’ve come across examples of setting up phoneprov.conf and pushing configs via TFTP. It’s looks attractive, but I am unsure if I am required to use Asterisk’s built in SIP signalling.

Currently I have a SIP registration proxy sitting between my phones and my Asterisk instances. Will this separation preclude using the baked in Asterisk provisioning tools?