Integrating Splynx radius with Pritunl openvpn

We are evolving to offer special low tarrif to smartphone and tablet users via secured vpn (openvpn). For the vpn access concentrator we plan to go with pritunl - - which support radius authentication
The challenge is to integrate customers and their service in splynx billing and radius with pritunl as network access server (nas).
Has there been such a use request? Is the integration feasible?