Project collaboration between free and pro users?

I'm doing a bit of research for an upcoming crowd-sourced project and I think Unity is going to be perfect given the volunteers skill sets and experience. One potential issue though is that as the project aims to make use of the Oculus Rift which if I'm not mistaken requires a Unity Pro license due to certain feature requirements.

As the team are volunteers, a large portion won't have or want to fork out for a pro license which is fair enough given the cost. What I want to know is, is it possible for free users to collaborate with pro users? If so what would need to be considered? Cheers!