Common ground? (no replies)

I am rewiring my Prusa I3 Rework and was looking at the number of wires needed for the hot end assembly. My setup has the following wires going to the carriage:

• stepper - 4 wires
• 24v 40W heater - +24V, GND
• E3Dv6 fan - +24V, GND
• part cooling fan - +24V, GND
• thermistor - 2 wires
• BLTouch - SERVO SIGNAL, SERVO +5V, SERVO GND,

I was thinking at the very least I could combine the ground wires of the heater and fans and maybe the BLTouch if the +5V ground isn't isolated from the +24V ground.

Has anyone tried this?

Thanks,