Wildcards in Username and Passwd

Hello I have a customer who would like to have 100% MAC address lock down on their network. To do that we are able to have the Ethernet Switches Send the Device MAC address as the Username and password to the Radius Server. The question I have is on the radius server is it possible to set a wildcard so that any device showing "00-E0-BB" as the MAC Address prefix will automatically be accepted then I can throw the usual variables back at the port. If this is possible then I can avoid having to enter 300 Devices into the Radius table. Thanks in Advance Jason Montogmery