[Observium] Custom port service type?

My port naming convention for core ports doesn't follow the "Core:" spec required by Observium. Is it possible to specify a custom type, or perhaps change the default? I'd love to see my core ports with a click of the Ports drop-down hopefully by avoiding having to reconfigure over 400 port descriptions. I can't see anything in defaults.inc.php and I'm not well enough versed in php to really know how to go about looking through the php code to try and find the answer. My google-fu is failing me too, so any pointers would be greatly appreciated.

Thanks in advance.