Hi!
I think you should be careful connecting something to the equipment since the image shows what could potentially be a short. I also know that the USB-C port can only be used to charge other devices, like a smartphone, but can't be used to charge the laptop itself.
I have bought a cheap Microsoft Surface Book 2 charger clone from Amazon that works just fine.
You also could try to purchase the keyboard part from AliExpress or Amazon, I know there are some replacements around the market.
Or you could also look for a neu keyboard part at e-Bay.