Your suggestion is not without merit however, it would be difficult to administer. Think of all the confusion the Naval ranks currently create in the "purple" trades employed in army and air units, and extrapolate that out with the introduction of new insignia. In addition, there are several ranks in the current structure that didn't exist in the "old" navy. While I'm all for reinforcing element affiliation, there are some things that are just too hard to implement in the real world. Bringing back the Royal prefix to the RCN and RCAF are initiatives that would / should accrue a great deal of support.