If the point is to monitor the other divers' cylinder pressure, I believe there's only the Garmin transmitters that have sufficient range for that (and even then, it's tricky). Most transmitters will top out around 1-2m range, whereas the Garmin transmitters can have a range up to 10m (in ideal, line-of-sight conditions). I believe you can have up to 4-5 transmitters paired with a computer.
I would recommend teaching everyone good habits and have them monitoring their own pressure, but that's just me.