I am able to create and install(in iOS devices) general mobileconfig profile generated by iPhone configuration utility(IPCU) v3.5(289) in Mac OS 10.6.8.
You can use a new certificate for the identity certificate - it does not have to be one from either developer account. Upload the certificate (p12 format) as a new 'Credential' and then select this certificate for the MDM payload in iPCU.