Just get the 1570 which can do Flex+Bridge on code 8.5 and solves your problem :-).
Also it looks like code 8.8 may support Flex+Bridge on 1560 but then you would need to upgrade both APs at the very least (and any other you have running)
To answer your question - You won't be able to host a Flex/Local switch WLAN off the MAP and it won't then drop 'locally' off the RAP - I imagine it would just break completely but it would need testing. TAC certainly wouldn't support it in the event of an issue.
Ric
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