You would be able to use a shorter shackle to get a small drop. I find myself in a situation where a SOA gives me a bit too much lift and Im looking to use some OEM shackles off a Jeep XJ (1" shorter than our stock shackles) to drop it a bit, along with removing the overload leaf.
In your case, if you are still SUA, you will be able to use a shorter shackle and still fit the springs, to a point. One of the fellas we went to Moab with last year had a tiny 2" custom shackle on his 2door, worked well enough.
Anything lower than that and you will need to turn to blocks to lower your ride.