Bridging is not standard so you need 2 devices of the same capabilities to do that. So that won't work for you.
If you configured your 851 for workgroup-bridge (not even sure it can, I don't have a 851 close to me that I can try with), it would only work for one client as the linksys AP doesn't support IAPP.
So I don't see many ways out for you.
Nicolas
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