I am not convinced that doing that will get you a "narrow route briefing" that uses those airfield IDs as waypoints.
Another issue with that practice is that, one day, you may get caught when you go abroad and the flight plan processing agency decides to actually validate the route
I have always advised in favour of using wholly "IFR waypoints" on VFR flight plans. It bring a number of benefits:
- Narrow route notam briefings work
- The flight plan is ICAO-valid so should work anywhere
- The waypoints are present in all GPS databases so loading the route into a GPS is quick and error-free
- If you request some CAS transit, giving the ATC unit several IFR waypoints shows that you can navigate and you are unlikely to cause them trouble. ATC will always deny (officially) that this makes a difference, of course
But ATCOs are only human and in higher ATC workload situations you want to sway things in your favour. Throw in a bit of a reduced english language proficiency abroad and .... when e.g. French ATC say "Deauville" they won't mean the town, they will prob99 mean the DVL VOR.