I could be completely wrong, but I'm not aware of an option that's similar to disabling Use302ToCallForward in the PAP2.
If so, no: call forwarding won't work without using FPL's portal.
Perhaps someone else knows for sure. Basically, the call needs to be bridged when using FPL.
Other than offering Follow Me, FPL disabled call forwarding due to potential abuse, AFAIK. Unless the calls are bridged, forwarding doesn't work.