The things we do for beer! I have never done either of these before, so take my opinion as you will. I think you're correct that not heating the sparge water will reduce your efficiency because the sugars are less soluble in colder water. Not a big deal. As for the hops, Your going to get a lot of nose, but very little bittering out of them. If you still have the hops, you can try to make a "hop tea" and add that back to the primary. What kind of beer is it? If it's pretty light, you might get away with this, but for a darker, malty beer I think it would be too far off balance without utilizing the AA more.