Important point to remember here is the actual throughput on an 11Mb 802.11b network (assuming noise level is such that it doesn't need to drop down to 5.5Mb) is higher than 10Mb Ethernet. The overhead on 802.11b is LOWER than Ethernet.

So you won't have any badwidth issues at the wireless end if you have 10baseT for your wired end.

And I've never seen the overhead get up as high as 50%, even on the earliest 11Mb kit Telxon produced, way back when they were the only producers of 802.11b DS kit.