When are you even supposed to change the chain on the V12's?

Look at it this way, every 5 years you have to spend $5k+ at the Ferrari dealer to have the belts changed. So the MB V12 is still a bargin with a $1k-$2k chain replacement once or maybe twice during its lifetime.

Since the special tools cost so much I would get a few prices from shops or the dealer. It might cost just as much to have someone else get their hands dirty.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200