RTH doesn't need transmission of location data. The AC records it's initial GPS coordinates (gotten by passive sat reception), then during RTH, heads back to its saved location.
Tracking on the map does require transmitting AC location though.
RC only needs to transmit location when you select to change home point to current RC (really mobile device, RC itself has no GPS) location.
Hobbyist always required notifying airports within 5 miles. Part 107 have LAANC in most areas. All that needs to be done is let registered hobbyists participate in LAANCE, and change "notify" to "get permission", which the new law already specifies.
Even before LAANC, electronic notifications were available in Airman. Some airports, such as TIA, provided submitting notifications through a website. It covered two other close by airports.
Unfortunately BKS doesn't support LAANCE. It should though, it's big enough.