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Install debmirror
sudo apt install debmirror
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Download debian mirror to an external drive formatted to a file system supported by your raspberry pi in order to get offline access to all packages.
./download_deb_mirror.sh -o /path/to/external/drive
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Download Raspbian and flash the SD card with the image
./raspbian.sh
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Power on and login to Raspberry Pi
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Adjust keyboard settings to your liking (probably XKBLAYOUT=us XKBVARIANT=intl) in:
/etc/default/keyboard
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Adjust the date settings to your liking:
sudo date -s "1 JAN 2020 00:00:01"
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Execute start script to install all required packages
chmod +x start.sh && . ./start.sh
Follow steps 1, 2 and 5, using the new debian version instead of "buster". Additionally, run:
sudo apt full-upgrade
https://www.tobanet.de/dokuwiki/debian:debmirror