RDS Scenario | Licensing

Hi All:

I've got a scenario that I'd like to implement, but I'm baffled on how to "get there from here". In short:

• I've got a TechNet Professional subscription, which I'm aware comes with no RDS CALs.
• I've got a home (virtual lab) on a Hyper-V host with a number of servers used for testing.
• I'd like to be able to access different servers in the the home lab from the internet via Remote Desktop (through Remote Desktop Gateway). The idea here is that I don't want to use a service like LogMeIn or GoToMyPC; I want to handle my own remote access needs.

What has me so confused is RDS licensing. For the above scenario, what approach would I take to be properly licensed?

Thanks!