Straight answer to v mounts is i don't know. I don't see why not, I've done some quick research and there are various options out there in different diameters so I would think some would fit. I'll measure the leg diameter, but from memory they are smaller than pace.
As for fitting a 700c wheel, absolutely. Laying them up against my 29er wheels sporting 2.25 canis tyres there is still loads of clearance top and sides so a gravel style tyre would be fine.
