Idea for Champion select that helps teamates pick with intent to trade

Currently in Solo Q if you want to take a high priority champion for a teammate that has a later pick, it can be frustrating communicating to them what champion they need to take in their later pick so you can swap, even more frustrating is the time frame you have to communicate with this player you most likely don't know, and you have no idea what his/her champion pool is.

There is currently some empty space on the screen in champion select above the portraits in between the skins tab, and the search button. Wouldn't it be very player and strategy friendly to implement in that space a filter feature that allowed you to select a player or players on your team and then the champions shown would be those that all the players selected along with yourself have access to pick? this would make it very easy to then suggest to the player a specific champion that you know you both own. I just think something like this would really help soloQ players communicate easier and make better picks when they want to communicate and swap in champion select.