That's a common chip, not really a surprise
Pin 1 is an IO pin so sounds like you're good there, just need to find somewhere to to solder to. You could go straight on the pin but I don't think your soldering skills/equipment are up to the task, it's very small so easy to bridge two pins.
I assume Pin 1 works for the other switches too? You can take off all the wires on the top pins and if they work put short wires on, may as well do all of them to be safe.
Which way is the chip rotated? There will be a link from somewhere on the end column(s) to the chip, if pin 1 is at the bottom of the board the trace will be running round the edge, if it's at the top it will probably be in the middle. Any clues would be good, then it's back to the pics.