Exhaust doesn't need removal to swap mounts. But I'll be shoulder-deep in that area, especially the passenger side (see below). There are a dozen methods if you poke around on YT. My favorite methods I've seen:
Driver side: Steering shaft comes out and exhaust heat shield loosened. Mount can be snaked out and replaced.
Passenger side: Starter, oil dip stick tube, fender liner and exhaust heat shield come out completely.
Upgrading the manifold bolts now, at 120k miles, seems like a good idea, before more break. All it adds to the driver side work is pulling the fender liner for better access. And if I pull the passenger side manifold off, I may not have to remove the starter to swap the mount, so there's that.
Or maybe it's too late, some of the bolts are nearly broken in the head, and I'm about to bite off more than I can chew. It's probably that, lol. "Nine hundred bucks, you say?...hmm".