After install MacOS Catalina on my Chuwi Aerobook Plus, Trackpad cannot work correctly as well, so can do the following step to make it work.
Show contents pkg on VoodooI2CHID.kext
Open Info.plist with PlistEditor Pro
IOKitPersonalities-->VoodooI2CHIDSYNA3602Device
IOClass
Rename VoodooI2CHIDSYNA3602Device
to
VoodooI2CHIDSYNA3602&Col2Device
IOPropertyMatch
Rename SYNA3602
To
SYNA3602&Col2