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@Dammit
Mercedes would retrofit your C43 with the engine from the C55 when it was released, if you asked nicely and paid a non-trivial sun of money. This was when AMG were more of a separate business than they are now, but there is definitely precedent for customers having later engines put into their cars by the factory. A 6.3 engined W124 is therefore possible to imagine, even if AMG/M-B never did it themselves.
When converting the C43 it required a new floor panel to be welded in to accommodate the new differential- the C55 diff is both larger and heavily finned to dissipate heat, and that wouldn’t fit under the C43 shell.