I have a TRP hy/rd on rear, which has been fine. Hasn't fried. Figured I'd use that on front. Co-Mo, Santana and others put cable discs on front, so I assume they work without frying.
I have tried the hy/rd and didn't get along with the lack of lever throw once they are adjusted correctly. My Pangea Rohloff came with the Spyres. The Paul Klampers work much better and I run a ebike disk rotor on the front. Your not going to fry a mechanical unless they have plastic that melts like what happened to several Tandem teams and the pad adjusters melted.