Add a hotkey to cycle Universal Terminal terminals.
This would have the same functionality as pressing the "Open Next Terminal" button.

The Universal Terminal could be given its own hotkey that opens the Wireless Crafting Terminal interface and then cycles like using the "Open Next Terminal button" on repeat presses.

since the latest release (for 1.20.6) it is possible to use the wireless terminal keybindings while a wireless terminal is already opened.
do you think this is sufficient or do you think an additional keybinding to cycle terminals would still be useful?

An additional keybinding would still be very helpful. The button moves between terminal cycling so it can be annoying to switch between them.