I'm gonna disagree and say NHLPA would be for it as they are there to help their base, and a players making $60000+ plus in salary vs what in CHL.
To get the CHL to change their agreement is money, and that's NHL vs CHL,
A NHL team wants full control over their draft picks it's what European soccer clubs have, they decide if the players is called up on first squad, second or loanded out. Since they "own" the player. I would want my draft picks to play where beat development, if I think that's CHL, SHL, or CHL should be managements job