Two SSIDs on WIFI and two VPNs

Here is the task:

1) Connect to the Internet provider through WAN cable; establish PPTP channel (standard done from the router menu)
2) Provide WiFi to a few devices (standard done from the router menu)
3) Connect to a VPN server in the US through the Internet (not standard)
4) Establish a second SSID "USVPN" and through WiFi connect on computer to this "USVPN", while all the rest of computer are connected through #2 (not standard)

Question 1: I read that #3 is doable, but not sure if #4 is doable with #3. I can go with any firmware if needed (currently I have DDWRT).

The easiest solution is to buy one more router and set it up ... but it seems not right...

Question 2: Is there significant degradation in WiFi performance with two SSID instead of one?

The whole idea of this task is to have to be able to connect to NеtFlix from outside the US, while have the rest of computers to work in the Internet normally and locally...