Cheaper to go conduit nuts, also with OME springs, a 1/2" spacer might be too much.
As for a level stance, OME is pretty level. When you add to the front you go nose high. Add 1 extra upper isolator to each side in the rear. That'll add 1/2" of lift. If you did both the plate and clevis you'd add 2 per side.
That's OME 927/731, Bilstein shocks, Al's a-arms, 3/8" clevis, 1/4" top plate, and 2 extra isos per side to get 3.5". That was right after install and the 2nd alignment(after it settled a tad).
That's a year later. The end of my driveway isn't as level as in front of my girlfriend's house. Also keep in mind I'm at, or almost at full lock which tends to lift my Jeep a little.