You can turn bump.stocks “off” so you could still use them at that range.
In any case, I would find another gun club.
You can bump fire without a “bump stock”. Idiots bump firing with bump stocks sent projectiles from one range onto another on multiple occasions which could easily have resulted in serious injury or death.
Our ranges are located on leased public lands. Any incident that resulted in death or even injury could result in the lease being cancelled. Banning a device which creates danger to the membership and could easily result in the demise of the club is common sense.