I played around with the RPi 4b 8 GB + 64 bit problem. I came up with an image for the 64 bit RPi 4b and here it is for anyone who wants to play with it.
Start by downloading the following file
https://pudges-place.ddns.net/EndeavourOS/RPi4-image.tar
Make a Temporary file off your home directory, such as /home/username/Temp and copy or move the downloaded file “RPi4-image.tar” to Temp.
Using your file manager use Ark or other archiving tool to extract RPi4-image.tar
Open the .PDF file with your document viewer and follow the instructions to burn the image to a micro SD card on a x86_64 Linux computer. Put the micro SD card in a RPi 4b 4 GB RAM or RPi 4b 8GB RAM device and it should boot up ready to go for installing a DE.
Many thanks 
to @linesma who originally wrote the How to Guide for a similar project we were working on. I hastily edited it for this application.
Any feedback would be appreciated.
If this works out well, I will start a new Topic for this work around installation.
Pudge