1. The RAP-3WNP should be able to run as an Instant. If it is now a campus-AP or Remote-AP, after a reset with the reset button, the AP should return to Instant firmware. Check this post to find the reset button.
2. I assume connecting a VMC on a single port should work if you only connect the first production interface, which is the second network interface in VMWare. Leave management disconnected, and use in-band management.
3) Licenses for the VMC are on the Mobility Master if you have them, and you can connect two (or more) VMCs on the same license pool. For the right eval licensing, please work with your local Aruba Sales team.