After upgrading to Monterey, there isn't a scan driver for a Xerox WC3225 scanner

You can use Apple's Image Capture app which will scan, but is not full featured. You can download and try the VueScan app for free. It prints with a watermark in the test mode. I use it and can recommend it. It's well supported. I have no association with VueScan.

Just a footnote to the VueScan recommendation. It supports the Xerox WorkCentre WC3225 without any installed vendor driver prerequisite.

I purchased VueScan Professional in 2010 to support a flatbed scanner that Canon had abandoned driver support. The current version of VueScan Professional still drives that scanner on macOS Ventura 13.2. In 13 years, I have never paid the VueScan vendor any upgrade fees.

I am not compensated in any manner for mentioning VueScan here.