Should be able to work yes. Define on the WAN side from your Linksys an IP address in the same range as your router and set the default gateway to your m0n0wall router. You could do this by using the DHCP server inside m0n0wall and let the Linksys get the IP from the m0n0wall box.
I have this setup running here, just not use a Linksys WAP, functions well.
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