I would assume there should be a way to read data coming from the touchpad module itself, but I think it’s hard to tell what is exactly going on without the data sheet. I bought breakout board for the 51 pin connector (Something like this) and connected the I2C pins / 5V / GND to Raspberry Pi. Using I2C dump I saw some data output from the touchpad, but again unsure what any of that means. I also saw CRImier’s input controller board but as far as I know that one also only works for the keyboard, not the touchpad