Yes you can use any 2,4ghz device as close to your st16 as you want. I am using always a 2,4 walkietalkie when i m flying to communicate with my spotters. I had also 2 Taranis transmitters and 2 differents 5,8ghz video receivers in the same table with my st16.
The trick is to power first all the other tx-rx and last power the st16 and your Typhoon.
3 days ago we had one Taranis tx , one 5,8ghz rx , one 3dr telemetry transceiver 500mw and 1 walkietalkie,and the st16 all in less than 2 meters nearby.Everything was rock solid.