just because everyone i speak too seems to think this is impossible and another disadvantage for consoles,
all you need is a laptop

-switch your ps3 from wireless connection to wired
-get a crossover ethernet cable
-put your laptop near your ps3 and wire it up
-enable ICS (internetconnectionsharing)
-connect to the vpn on your laptop
-you are connected to the vpn on your ps3.

people have been doing this for years to watch Hulu/Netflix shows from countries they don't live in, it's no different for WTFast

its not for everyone as its a lot of effort to go through to knock your ping down a bit, but the options there..