Just an observation, but red cable at the top of the switch is considered poor practice and could be dangerous. There should be no copper exposed past any terminal. It might just need inserting a bit more into the terminal, or a bit trimming off the end for it to sit in the screw terminal correctly.
What’s really concerning is that it’s an extremely shallow back box. Unless you chop a deeper one in or put spacers in you won’t be able to fit in any relays. I assume you’re planning on this?
That was the idea, but I was even thinking of even trying a surface mounted switch. However, it appears that this won’t be possible with the wiring judging by the responses (yes the light can be controlled by 2 switches)
However i might try the 2 wire options that I have seen posted.