How to use BirdNET Pi in the field without home router access

My plan is to go into the field for a week and take a BirdNET-Pi with me without any Wifi access. So I found this thread -thank you all for the hints!- and it worked! Here is a step-by-step workflow (maybe you would like to put this into the WIKI, Patrick ? @mcguirepr89 )

etch the usual 64-bit LiteOS on an SD card using Raspberry Pi Imager and using your home Wifi connection SSID and password
connect to BirdNET-Pi on your home Wifi and use the one-line-installer to install BirdNET-Pi [the installed version is from May, 4th, 2022]

From now on, every step can/should be executed in-the-field (without access to your home Wifi router)

configure mobile hotspot on your smartphone/tablet to use exactly the same SSID and password as your home Wifi router (brilliant idea by davidmam #119 (reply in thread))
switch on hotspot of your smartphone
BirdNET-Pi should now connect automagically to your smartphone and should be visible as a device in the mobile hotspot settings menu
for iOS users, it might already work at this point by using birdnetpi.local in the Safari browser. However, Android users have to perform the following additional steps:
write down the local IP adress of your BirdNET-Pi that is displayed in the mobile hotspot settings menu
ensure you have Juicy SSH or any other SSH client installed on your smartphone
connect to BirdNET-Pi via your SSH client on your smartphone using the local IP and user name / password
in the terminal, issue: sudo nano birdnet.conf
change the line BIRDNETPI_URL= http://MY.LOCAL.IP.ADRESS
save with CTRL+O, exit with CTRL+X
in the terminal, issue sudo update_caddyfile.sh
after a while, the BirdNET-Pi can be reached in your smartphones browser using the local IP adress