If the applicant meets the established requirements for a Class M license, and also possesses a Class C or combination of other classes of permits, that license must be surrendered and a photographic license containing the Class M endorsement will be issued. The applicant will not be given a refund for their remaining period of validity of the other license, but such endorsements would run concurrently with the Class M endorsement.
I don't think you have to have a driver's license to have a class M