SUCCESS!
Upon reading the above, I ran down to two local Superchargers, a V3 and a V4. Both worked with my 2020 Kona Electric Ultimate and A2Z adapter using the Tesla App!! With the V3, need to scoot the car over to the right so the front edge is close to the parking spot dividing line, but the station itself was in front of the car and the cable reached with no problem.
The Tesla app is easy to use:
0. I double-click the key fob UNLOCK button and open the Kona charge port and remove the connector socket covers.
1. Open Tesla App
2. Tap on the three horizontal lines ("hamburger") upper right of the screen
3. Scroll down to Charge Your Other EV
4. Map pops up and the phone's GPS locates you at the charging station site
5. Select the station number that you're parked at
6. Tap on Start Charging and the app tells you to take the Tesla plug and stick it into the adapter and then take this adapter+cable and stick it into the car charging port. I double-clicked the key fob UNLOCK button for good measure before sticking the plug into the car, but probably don't need to do this.
7. The app then says something about initializing charging and that it might take up to a minute to start charging but the car connected within seconds and the app then shows the charging progress with the car's SOC, charging cost accumulated, and charging rate in kW. After the session, the charging session screen shows the location, date and time, and charging details such as duration, the charging fees, the energy delivered in kWh to the fourth decimal place, and the option to go to the Charging History which then also shows the same information plus the cost per kWh and the option to get an invoice.
At the V3 station, starting with 43% SoC the car drew 53kW whereas at the V4 station at 59% it was drawing 54kW.
I normally don't charge any higher as for all my local driving I keep the car at around 50%SoC, so I didn't get to see how much it tapers off at higher SoC.
Delighted to now have this charging option available and working.