1 hour to locate and install perches and shocks?
That is asuming that the housing is cleaned stripped sanded and D/Aed. Welding tubes to the center section is a 8.8 must. Installing new seals and bearings while you are in there?
Anyone can throw an axle conversion together, it does however take skill and know how to set pinion angles, plumb and install the new brake lines for the disc conversion, not to mention welding the perches.

When we do a an axle swap it all looks and works like brand new, not like a junk yard axle was swapped in by folks in a hurry to save a buck. 2 K is on the cheap side, but if you feel confident that they will warranty the job and make right any problems? By all means. Also if tire size is kept to 33-35" tires max and the trails are not super crazy, the d30 will live for years, making the rear 8.8 swap worth doing.

SD