Hmm I see. I think I was getting confused since I searched for browser app in settings and ended up setting browser app as well as Voice and Assist app as Firefox as they are in the same submenu.
If I choose Voice and Assist app as Firefox instead of Google then active edge, Ok Google does not work. May be I could just try setting browser app to firefox.
Let me give this combination a try for a few days. Browser is firefox and assist app is google which as you say still renders some links in android webview.