Crossunder
Just advise your aircrew that, whenever they are in unfamiliar skies, ATC may call them using the phonetic 3-letter code.
Eventually ATC will get to know you, and some ATC units can adapt their information displays [ radar labels and/or paper strip] to show your spoken callsign automatically.
When BRA changed their callsign it took a while to get used to the new one.
Please don't change your callsign for our sake...it would serve no purpose: and besides that, a fine piece of aviation heritage would be lost.....be proud to be Wideroe.
If I am working a previously unknown operator I can take out the ICAO book and look up your airline and your spoken callsign, your local ATC facility should have a copy.