I found this thread moments ago. Thank you for sharing so much.
Before starting ChipWhispering [the HCS301] I made a Keeloq repeater that sent an amplified copy of the signal received from a remote control. I did it to open the gates to my community without leaving home.
ChipWhispering is a totally different game though.
Now I have to ask you: Have you made further progress since June 2020?
e