I don't know the cost but it's about an 8 hour job by an experienced person. An existing dummy hole in the side of the block has to be drilled and tapped after removing part of the front suspension and the diff to gain access to the area.
When agreeing to purchase my L322 from a large LR dealer, I asked that the job be included in the deal after presenting the salesman with the front page of the TSB. When I collected the vehicle the business owner made special mention of the amount of work involved, which I already knew but left it to them to discover when they read the whole TSB.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
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