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Did you tried SAN certificates (also known as Unified Communication Certificates by Public CA like DigiCert, Entrust etc..) ?
SAN stands for Subject Alternate Names - this allows more than one hostname to be binded to a single certificate for such multihosting setup. I think you should try using a self-signed SAN certificate before purchasing a SAN certificate from External Public CA (if you rely on External Public CA). If you have Private CA then I think there should be much cost impact for you.