IMO - yes. I've made a number of Mosaic-only beers and like what it brings to the table (even as a solo-hop). With this grain bill I wouldn't hesitate at all to do what you've mentioned. I do think keeping the Nugget is important, though (as you said you would). I've brewed this without it and it definitely makes a big difference in the profile.
So...my vote (having brewed this and other Mosaic beers multiple times) is to go for it.
So...my vote (having brewed this and other Mosaic beers multiple times) is to go for it.