Sounds good, but I’m afraid it could be hard to implement
I mean, as far as I remember, multiplayer ranking is based on Bayesian statistics and compupation https://discourse.codecombat.com/t/sharp-drop-in-score-when-submitting-new-code/1629/2?u=alexbrand . If competing with non/subscribers would be a match option it may bring some mess into ranking system.
P.S. Came across to this interesting topic) Rewards for multiplayer levels