Hello Rajan
You are right UCCX 7.0(2) will be compatible with Windows 7 Environments but the release has been delayed until the 2nd Quarter of this year.
At this point there is no supported way to run CAD/CSD/HR software in winrows 7, as you mentioned you can try to run it in compatibility mode but if you face any issue TAC will ask you to test using a Windows XP machine because Windows 7 is not supported.
As you mentioned as well the only the only option to support Windows 7 desktop is to upgrade UCCX to 8 for 32bits machines or 8.5 for 64 bits machines
HTH
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Walter Solano