Progress update:
Aldous is not willing to undertake the reflash. Not sure if he was being humorous with me or not, but he replied with an email describing how he would have to pull out the code from the Ferrari 360CS and the 4200, compare them and create spliced code, taking weeks and cost estimates it would be immodest to display here.
On the good news side, there once was a man from Toulouse (this could be the start of a limerick), on the FerrariChat forum (eric355), who has been flashing 360 TCUs with the 360CS software since 2014. Cost is not advertised, but he has a very loyal following in that group, consistent since he started the practice. No mention of flashing Maserati TCUs, so I'll give him a shout and see where it goes. You are welcome to do the same, here is the thread of interest - note, the thread has been closed for comments, so you'll have to message him another way.
Challenge Stradale TCU Upgrade | Page 12 | FerrariChat
From reading the entire 12 pages of the thread, the 360CS software works fine - but you need to transfer over the clutch wear and set the PIS with an SD2/SD3 for it to work right. The Sport button then toggles between Sport and Race modes. Which means the unicorn is possible, Sport mode with a softer Skyhook setting.