Route stereo tracks in routing grid

Hey!
Routing grid is a great tool, expecially for routing multitrack plugins to multiple busses: you just need to draw a diagonal line! Do you know if it already exist a routing trick like this to connect several stereo outputs to one stereo input? (e.g. example for linking several keyboard tracks to a bus) If not, I imagine a modifier key that turns the line into a zigzag pattern. Is it a good idea?
Thank you!

On my phone right now but going off memory, Group the stereo tracks in the editor and the right click on the group to create a subgroup and route the tracks to the subgroup in one action.

Thank you! It works perfectly