Ok, you guys are fast
Removed all the kexts you guys suggested and rebooted straight in, That is good!
For the Atheros card: AR5B22 half mini PCIe (here's the link: https://www.amazon.ca/gp/product/B0875QJK83/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 )
For the original wifi card: Intel Centrino Ultimate-N 6300, model # 633ANHMW
I then copied the Voodoo kext supplied by Jake Lo, rebooted and still no trackpad.
Then I moved to Hervé's post, installed ALPS kext but forgot to remove the other Voodoo and rebooted to a circle with diagonal bar (sorry I don't know the name of that sign) on Catalina drive. I did try the recovery drive and it seems to be reinstalling right now from apple.
Funny thing, after rebooting from the recovery partition, the trackpad is working...