I only read part of your message. I agree with Brandon. IMO, better to have 2 licenses, but you really need to confirm the license type, is it CPU, site?
Follow Brandon's advice.
Lot's of reading here:
I would recommend talking to PageGate to ensure you do not violate their licensing. We do not own their software, so I cannot say yes. We do not protect their software out of the box either, so you would need to create some custom rules.