It sounds as if you are over complicating a very simple job. Disconnect the sway bar links and shocks. Make sure the bump stop extensions are unbolted. Tires will need to be off to allow the axle to droop enough. Lower the axle while supporting the frame with jack stands. Once the axle is low enough, remove the springs. I have never had to use any type of spring compressor for JK springs in the 3.5-4" lift range.
2010 JKU. 3.5 RK Flex, 37" Nitto Trail Grappler MT, Method 105's. Poly Drag link, Fusion 4x4 Tie Rod, DIY Hydro Assist, Ultimate Dana 44 Front, Rubi 44 Rear. Ten Factory Chromoly Axles, EVO RockStar Skids 5.13's, VKS Shorty V2 with Warn HS9500i, EVO rear D-ring mounts, VKS Prerunner Sliders, Synergy Cage