If it was me doing it, I'd look at dispensing with the existing PP and EGV units, instead buying more Mark 4 DVTs and converting the Citygold cars in each refurb set (toilets, PIS, wifi, power sockets, pushpull) to act as a "transition" vehicle which would present the same interfaces for coupling, power and control as Mark 4 stock do to their DVTs.
But it's not me, and it's not happening, not least since it would also require reactivating the stored 201s, possibly requiring PP on some or all of them, and reduce the projected life on the 100mph sections.
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