You can make a keyboard shortcut in the settings that runs a script that simulates f7. From the top of my head
Installydotool:
yay -S ydotool
sudo systemctl enable --now ydotool
Create script~/f7.sh:
#!/bin/sh
ydotool key f7
chmod +x ~/f7.sh
Bind it via System Settings → Shortcuts → Custom Shortcuts → New → Script/Application.
Set trigger to e.g.Ctrl+Shift+F, Action to/home/youruser/f7.sh.



Buy a phone that can do display alt mode over USB.
Buy a usb C display.
Mount the display in the car.
Connect to your cars bluetooth audio.
Viola!