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IMO 12 thousandths is a big warp.
Yes, they make prechamber spacers or seals and thicker head gaskets. Everything needs to have the proper angle to the dangle to be happy, and that means making sure everything has the correct spacing.
You definitely want to be sure the machine shop can pull the PCs and work with the head. Machining is much more critical with diesels because the interference is very unforgiving and you don't have much wiggle room to skim. The 602 was popular, so you shouldn't have trouble finding a replacement head if yours is a no-go.
John at Costa Mesa R&D in Cali is an amazing machinist. He can thermal clean, bead blast, and then pull the warp out and/or skim the head flat. You might give him a call and see if he could work on an MB diesel head. He's familiar with VW diesels.
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