You *should* just be able to change the subnet on the wireless router and then plug its WAN port into a LAN port on the wired router. So if your subnet on the wired router is 192.168.1.XX, make the subnet on the wireless router 10.1.1.XX, which you do by accessing its webpage configuration and looking at the LAN settings.
Then, anything connecting to the wireless router will get a 10.1.1.XX address, which will go out the WAN port to the wired router, which will then route it out to the internet.
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Better educated sadness than oblivious joy.
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