Turning a 2wire modem into a wireless gateway into bridge

Highly unlikely. Most 2wire devices have a WAP that can't be wirelessly bridged to another WAP (not unexpected when you consider these units often come w/ the service, limiting features helps keep costs down). You could, however, disable the DHCP server on the 2wire, connect the WAP to another WAP over *wire* and create a wired bridge.

YES: [wap]<-- wire -->[2wire]

NO: [wap]<-- wireless -->[2wire]