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the ssdt is to fix the audio, not touchpad. This could just the limitation of the I2C kext since the Alps I2C is not fully supported. Try updating VoodooI2C and VoodooI2CHID to latest version 2.4 I think. As for you touchscreen, it's an I2C Elan900C. You could try adding VoodooI2CElan and see if it helps.

Catmater, I have the same laptop as you. I have clover bootloader with Catalina working good on it too. Was going to try OpenCore when I stumble upon this post. Post any updates if you can.