Maybe abbreviated call signs are a good idea, in some instances.
About 30 odd years ago,at JT, we had a pilot named Peter McBride,who,had a huge "stutter" problem.We heard him go out one day in a V35 callsign Kilo-Kilo-Kilo.
Now anyone who has the same unfortunate affliction will vouch that "K" is one of the hardest words to get out.The ATC's tried to help out because they knew him,but the more they tried,the more frustrated poor ole Pete got.
By the time he got airborne & requested an airways clearance he was bloody nearer to Perth airport than he was to JT.I am asure "triple Kilo" would have been handy because he blocked the airwaves for minutes.