Always lots of cat's to skin and as many ways to trim. I always cut holes in the baffle or anywhere for that mater after the veneer is on the substrate. (always) That my choice because the last thing I want to do is, cut a hole in a panel, and then cut another hole in the panel in the same spot as the last hole! The precious venereal is less apt to chip, flake or cause some other communicable disgrace to your project if the stuff is locked down too. So That the only reason I wouldn't use an upshear cutter on good veneer. Because there is too much time invested at this point to pull of a flake and make repairs.
Even the best glue (urea resin) only glues the surface and it the veneer has enough figure you can lift a flake and still be glued down.

If your routing pockets. deep dodo, rabbits or other furry creatures the upshear cutter pulls the waste out of the kerf like a good Hoover. wait... that's what he said.

Bill