If deployment guide says it is not supported then there is no option unless new firmware releases addressing this.
Check with Cisco about upcoming 8.0 code address this. (if it is not there in 7.6.x train)
Another alternative is use a normal AP converted as OEAP to see if it is working. Here is how you can convert normal AP as OEAP (I have used 7.0.x code & feature FlexConnect was know an H-REAP)
http://mrncciew.com/2013/01/15/configuring-oeap/
HTH
Rasika
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