Can I assign the hompoint to a key on the transmitter?

Hi there. Thank you for reaching out and sorry for the late response. After the aircraft is powered on, the default Home Point is the first location where the aircraft received a strong to moderate strong GNSS signal. Being said, we cannot assign the home point via the buttons on the Remote controller. However, we can update the Home Point manually via the DJI Fly app, please go to Camera View > Settings > Safety > Update Home Point. Be sure that the mobile phone has a strong GPS signal when updating the home point. Hope this helps. Thank you for your valued support.

I don't think so.