Yes, that would be like saying the same thing twice. That's why there is no such thing. Suffixes added to UPPER routes are only ever conditional route categories Eg: UG555R1. In order to determine what they mean, you have to consult the Enroute Listing. The RNAV suffix to which you refer is clearly for use on other airways with other naming constraints. Much like the example given on page 56 really: J888R - Jet Route 888 RNAV.
