Our shul is debating whether to add an egalitarian minyan. I'm on the board — how do I navigate this without tearing the community apart?

And hear the people making the request — often they are among your most engaged members, asking for more davening, more participation, more ownership, not less. That hunger is a gift, even when it is inconvenient. Within the bounds your rav sets, there is frequently more room than people assume: partnership models, additional minyanim, expanded roles that are entirely consistent with halacha when guided by a competent posek.

The failure mode is treating the askers as a threat to be managed. Treat them as committed members whose energy you want to keep inside the tent, and you will find creative answers that a defensive posture would never reach.