Zero experience concerning any of the Omix Adda products and I've never had original leafs re-arched.
But many times over I have disassembled sets of original springs and re-built them to near stock specifications with excellent success.
Simply reassemble and use the leafs with good arch left in them.
I prefer to cut the individual leaf lengths to provide more exact overall taper.
I also paint the individual leafs with graphite powder mixed into the paint.
Plus I use graphite lube upon re-assembly.
Besides that; the factory leafs were also assembled with graphite.
Graphite really helps a lot to smooth the ride.

You do have one other very good option .
You can install Superlift brand springs with a 1" lift.
The 1" lift amounts to a slightly more curved leaf.
To install Super Lifts you must convert from standard "U" type shackles to conventional designed shackles.
The Superlifts will work very well with Jeep "Silent Blok" shackles.
See: eBay # 171821942815
They will also work very well with Energy Suspension bushings. See: eBay # 311359678010

The Superlifts provide a softer ride with a lower GVWR.

Thanks for the input.  Matto, you are correct...Walcks does apparently have US springs made up.  Kaiser has the Omix springs.  I ordered the ones from Walcks and will see how it goes.