The 589 shock relocation kit is NOT a lift. The rear lower shock mounts are the lowest point on the truck, and they're considered a liability off road. That kit moves the shock mounts up, out, and forward in order to get the lower mounts up out of harm's way while retaining the ZR2's DSSV shocks and related geometry, travel, etc. Stock height is retained. This is intentional and desirable. The ZR2 is made to handle well on road and off road, at very high and very low speeds. The low CG is part of that solution. Said another way, it's not supposed to be lifted. There are products available to allow fitment of up to 35" tires on stock suspension.
As for mall crawling on a budget... If you get a 2" body lift and a 2" suspension lift, you can probably get there visually without introducing too many issues functionally. I'm not sure what the ramifications are in terms of linkages, lines, radiator mounts, and such, but no one (no one) said this was a good idea. I've seen people accomplish this with literal hockey pucks. I think the mall crawler on the cheap brand you're looking for on the suspension side is Rough Country. 2" probably won't be too difficult. If you want to get all 4" from a RC kit, do a search on here. A guy recently installed one, and ended up chewing on his U-joint and leaf springs due to axle wrap from the cheap block lift.