Dan, I don't remember if you have wood or aluminum on the underside of your soffits.
If they are aluminum, taking the aluminum down should allow you to install the baffles from below. That's what I did on our house last year when we added insulation.
I didn't take all of it down, just enough to get a couple of baffles in, and then slid some remaining ones down to reveal more spaces. When I got to the far end I put the pieces back in to button it up.
