If there is a long wait for healers, then upon winning a round of Solo Shuffle give the healer a “queue fragment”. 6 queue fragments can be combined into a “DPS queue token”. The DPS queue token is tradeable and upon usage bumps you to the front of the queue line for Solo Shuffle.
Healers are incentivized to queue and WIN their games. DPS can buy these tokens to reduce their queue times.
Implement a similar token for each pvp game mode with solo queue (Blitz, RandomBG). The tokens are not interchangeable between game modes i.e. cannot use the queue token from Random BGs on SS.
One exploit to this could be that high rated players make smurf accounts to farm these tokens and then spend them on their high rated DPS alts and given the low participation at those levels it might become a de-facto requirement for playing a DPS at a high rating. Perhaps adding in a rating range to the token might be a good idea as well.