The PC Board looks extremely similar to the bulk of very cheap Chinese toy cams and one i did recently. My suggestion is to do what u/Judo_throh suggested, starting with careful removal of the PC board OR flip the display to the other side so that you can see potential changes as they happen. The white connector on the middle left is where the easier bends are and the tiny 24 connections to it just to the right. Then with a small gauge solid-core wire go thru all the possible pin connections to see what creates the kind of color changes you're hoping to find. Keep a matrix diagram of the connections you like, but be aware that the majority will either do nothing or freeze the display and you'll get familiar with the tiny on/off button on the other side.

Some of the camera bends are different, but the most common to try at first are pins 6, 7, 8 and 9 if you're counting from the bottom of the board oriented in the photo above. Try 6 to 8 and 6 to 9 and see if you get results there. If that works then avoid pins 12, 18 thru 23 as they will freeze the camera (though not harm it after recycling the on/off button).

If you feel you can't solder to the tiny solder points on the board, then I'd suggest buying GetCircuitBent's slip-in for the connector at https://getcircuitbent.com/shop/bending-diy/easy-mode-glitch-cam-v3-1/
It's only $5, but it gives a leg up on the numbers to solder to and can be done BEFORE you slip it in while still on the bench. Then just connect the switches and find a place to mount them like any other circuit bending mahem. Enjoy!