This should work with Universal Work Group Bridge mode. In uWGB you specify the MAC address of the connected device, so it looks like the end device is directly connected to the wireless.
the following doc should help, just need to add the keyword universal and the MAC after station-role workgroup bridge.
http://cisco.com/en/US/docs/wireless/access_point/12.4_3g_JA/configuration/guide/s43hot.html
HTH,
Steve
HTH,
Steve
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