Yep, this is one for the Hmmmming birds.
If any projections (handle stubs, etc.) of the router fall inside the 7" diameter of the Milescraft base plate by 3/8" to 1/2" (enough to allow a reasonable support lip in the table), why not take advantage of the base plate's features? At worst, the weight of the router might flex the base plate a bit, causing the center to drop by some small amount. But, that can be tested and measured.
It might not be as convenient as a lift that allows above-table bit changes, but otherwise it's analogous to using a conventional router-table plate, just a round one instead of rectangular.