You'd need to fit audio mixers for every sub-region and region, with remote level control (to cope with sync or music), and need to feed clean grams (as the studio output will have the sustaining headline) separately from the studio to the switching area - so it's still not a quick or easy fix.
Yes, but all 15 or so devices would sit in the same equipment rack, so the 'op-ex' wouldn't be too bad. I'm sure it's the sort of thing our friends across the Atlantic wouldn't even blink at
Yep - I guess engineering the remote audio control, monitoring, dual main and reserve from different sites etc. may just prove to be not worth the perceived value though...
However if (and I think it's still an IF - though I think an RFI has gone out) they move to an IP system for regional production (possibly using remote production techniques) then that may offer some potential solutions.
The Beeb may also wish to have a facility to stick captions and tickers over 'network' ( a lá CiN evening)
so again something to think about. Although the last time I saw a BBC region do such a thing outside of CiN was BBC Plymouth in 1984, when there were electricity glitches affecting most of the region. I don't know of any more recent examples ?