Thanks, but I decided to upgrade to Ventura rather than experiment with STP. Fingers crossed!

As an aside, how does your response jive with
Originally Posted by Safari Technology Preview - Safari - Apple Developer
Surf seamlessly with iCloud. Safari Technology Preview works with iCloud, so you can access your latest Safari Favorites, bookmarks, and Reading List.
Wouldn't I first have to check both Safari and STP in System Settings > Internet Accounts > iCloud?

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire