There's... a lot of questions here. With radiation pressure, to get 1 newton (roughly the weight of an apple), you would need a solar sail about 360 meters (about a fifth of a mile) on each side. Presumably the Everfull Sails still needed to be full size, so the solar sails would still need to be as well, which puts us right back to square one on the solar sail issue. Unless you're creating actual wind in space, which would be it's own whole set of things, and would still require a massive amount of sail material.
Also, there's the whole issue of how the acceleration would be handled, if we stick with a "max speed" for space travel.