Yeah you can buy the skyjacker brackets seperate. I paid like $300 a few years ago for just the beam drops. The newer superlift brackets are drop plate delete as well, but the skyjackers are better quality/strength.
you can probably find a cheaper used pair of brackets.
Some guys have trimmed the corner of the drop plate to better clear the diff. Extend the bump stop quite a bit, but if you jump the truck at the dunes it won't matter, it'll hit anyways. The factory bump stop isn't very good. As long as you don't get any air under your front tires you might be alright. With that said I have ran the drop plate and punched several holes in my old D35 pig until I bought the Skyjackers.