I'm not a fan of the Hivemind in its current implementation at all, for a few reasons. The first and most importantly is its tendency to lead Clings into a team death-ball scenario, where they just group up and plow through any opponents (because several people who can revive any time you manage to take any down and can prevent you from perma-killing any if they fall is a massive pain to deal with for anyone). Secondly, Changelings already have a generally decent way to locate each other in a more natural way that requires them to actually do something, by stinging someone to no effect - similar to how Vampires can locate each other with ineffective glares. Thirdly, it just makes no sense at all - these creatures aren't actually hivemind entities, visible from how they act on entirely different objectives and quite frequently in opposition to each other. It's more like just chemical signaling but rangeless.
My suggested alternative, if simply removing it (which I'm also down for) is off the table, would be a more limited hivemind where Changelings have to physically establish it with each other and it deteriorates over time or perhaps distance. A similar form of this already exists in the weird ability to jam someone into the Cling Hivemind, I think reworking this to be how the Hivemind works properly would be a decent way to do it code-wise, so you actually have to locate a fellow cling in the field then jack them into your own communications.