If this is so, I'm trying to do just this.
I have my router set to Half-Bridged mode, and I want to now, instead of making windows dialout through the bridged half, I want to set up another router (on the same network) to dial out through the bridge.
I'm guessing its just a matter of choosing the correct Encapsulation method.
Both my routers - BiPAC 7300GA
I assume you want to connect both routers via the LAN ports? Since the 7300GA's are modems, they are set to make PPPoE connections out over the WAN port, which in this case would be the port going to the phone line. What you'll have to do on one of the routers is change one of the LAN ports to be the WAN port, and then connect that one to the other router. However, I have no idea whether this would be possible with that router.