That is an inventive idea. Is there a re-use for boxwoods, or will they need to take their overgrown selves to the mulch machine when the time comes?
I admit--I've had my husband use Roundup on the back yard. In Kansas, the climate is harsh. There's rarely enough rain; stuff bakes in the summer; plants you want won't grown; and the weeds go like crazy. We tilled and replanted the entire backyard and pampered it, only to watch the Bermuda vine take it. My husband says he has only one more yard left in him. This year it will be mulched over on the big area, and planted to a huge flower bed in the small area. When I say, "Big," I mean 20 paces by 20 paces. It's a postage stamp.
We're on the long-term plan. Let the roofers mash the yard, and then the painters. Finally, we will drop the electric, and put in that last yard. By then, the Roundup will have dissipated somewhat.
Until then, I read that serious gardeners use wet newspaper, followed by black groundcloth, followed by mulch, with little holes for plants. Our mulch has to be heavy as the wind takes it.
American Foursquare with Prairie and Colonial Revival influences