Have a toggleable mode for backpack radios where it can play one channel that your headset has access to on a speaker, allowing you to hear that radio channel above the radio in rune chat. Require engineering level 1 at least to set this mode active or modify it, and keep it active when taking the backpack off. Let the handset transmit on that channel when you pick it up and speak into it.
This would be really atmospheric and cool for things like command tent RP having squads or command net on speaker, or in medical tents having the radio set on med channel for the staff. It would also be good for people who have trouble tracking the text box, by providing runechat that’s easier to see during dynamic gameplay.