Multiple Talkback

Much like multiple P/AFLs, could each surface have it’s own talkback input and assign control?

Currently have a S7000 at FOH and C3500 at mons.
Both need to communicate with the band.
The talkbacks are linked. ie. I’ve given the talkback bus to the mons, but I can toggle it on/off via the FOH desk, which is funny at times but can cause issues.
And makes the whole FOH talkbacks section a little pointless.
Currently have to assign a softkey mute to the FOH talkback.