Nah. I say keep it how it is. Forcing a very mobile ranged to go into NOT melee range(12y), just slightly closer, every 10sec is not that big of a deal. Wait till you have both Purify and Guard if you are that concerned. I feel forcing a MCH to get a tiny bit closer to eventually gain access to an ability that has the chance to one-shot is a fair enough price to pay. Plus you have Scattergun whose knockback isn't covered by anti-cc like the purify buff, and there are plenty of walls and corners to play around.