Soldering Wires to this Keyboard's Circuit Board - For Arcade Controller Box

Описание: The idea is to use the keyboard, specifically an anti-ghosting keyboard which is really important, to process my arcade button and joystick inputs.
Each button acts like a switch, closing the circuit that would otherwise be for the keys on the keyboard exclusively.
An additional bonus is not having to buy a separate keyboard to interact with the PC. Money saved!
But, because this is an unusual setup I'm also having to modify the joystick PCBs.
The reason is, I need their microswitches + and - connections to be isolated.
But the PCBs they're soldered to share the same ground or -.
I can't just connect one ground to all 4 direction keys on the keyboard.
So, I have ordered copies of those PCBs from AliExpress.
I'll be able to cut into the PCBs and sever the leads that connect the grounds.
After which I plan to solder each micro switch to each key that's available on the keyboard to be what controls the direction in games.