You can’t use the variables in field which accept RegEx. The best way would be to have a RegEx as close as possible on your service name. Maybe you can provide some examples and we see how we can get this rule working for your services you like to disable.
If your have a dedicated number of hosts you can also use host tags to specialize your new rule.
If all of the Hosts would follow our naming concept, i could disable the service.
Using tags doesn’t help, because the service uses the hostname of the server.
But thank you for the first idea with the regex, it looks like the only solution.