I am not aware of any regulation that specifies speed limits for DME arc procedures as such, but clearly there may be restrictions in place for some specific approaches, and of course there is the 250 kt limit below FL100 for traffic not granted "high speed."
As much as I hate to do it, on this occassion I have to agree with 411A. If the arc is more than say 10 nm, and asuming high speed has been approved if below FL100, 300 kts does actually work like a charm. The bank angle is not as much as one might imaginge, but it is sufficient to assist adequate de-accelaration for config changes in the latter stages of an arc that intercepts the final approach course.
As an aside, although I agree with the genaral concept of SOP's, and the practice of flying "by numbers," I do sometimes wonder if the art of "airmanship" is being diluted as a result of them.