It is most definitely possible. I have successfully tested all the way down to a tethered 2G connection. I recommend connecting to the BIM Server remotely from a fast connection to download all your data then you can try connecting remotely with the tethered connection. It is also good to create a separate identity that you can use for your remote connection.
Archicad 25 (5005), Windows 11, AMD RYZEN 7 3900 (64 GB RAM)