This all of course begs the question: Is there an off the shelf Mercedes manual transmission with the correct hole pattern, mounting locations, OAL & compatibility to work with an SRT-6?

What would such a swap entail?

Would you need to also get your hands on a new ECU to work with a manual, or is the transmission's controller separate from the motor's?

(I spoke too soon before having ruled myself out of the SRT-6 chase. This thread has me thinking it might be worth contacting a dismantler/recycler in the UK).