Hopefully John's recommendation will work. There is a CUPS driver available for Big Sur (v11).
Only other thing we've recommended with some success is VueScan. This software is free to try.
Bay Area - CA
~R5C (188.8.131.52) ~Many Lenses ~DxO PhotoLab Elite ~Windows10 Pro ~EVGA RTX 3080Ti FTW3 Ultra
~ImageClass MF644Cdw ~Pixel6 ~6D2 (v1.1.1) retiring