Trigger volumes should track head and hands individually and separately!

I am currently working on a project involving swimming pools right now, and I really need this small feature added.

What I'm asking for:

A Trigger volume that can track just the player's hands, as well as the head individually. This would be very helpful for me. Basically it would be cool if the trigger volumes, both legacy and Cv2, could have a setting on the configure menu that only allows it to trigger once a player's hand enters it, same with the head. I hope this is not too difficult. I will be checking the update logs to see if my request has been approved.

My plan:

I am making a swimming pool, and I am making it so that the skydome color changes when the player's head goes under the surface, as if they were underwater. But in order to do that, I need a trigger volume that tracks just the player's head.

I hope you acknowledge my request.