Thanks, Ron. Yeah, I'm glad I put the brakes on and made the test mortise. When I was triaging the too-large mortise, I was amazed to see how much play there was with the plunge mechanism on that Porter Cable base. I've got a follow-up to post I'll make below on fitting the Festool router.
Steve - I agree. Even if nothing goes wrong with the test, you at least validate the approach.