If DB were desperate, could they not do either of the following.

Option 1:
- 6x StreetDeck OM936 or Scania E400MMC for X93
- 7401-06 to Ashington for X18
- 7529-33 & 7553-56 for X14/X15 (will leave 2x spare)
- Don't know about X20?

Option 2x:
- 12x StreetDeck OM936 or Scania E400MMC for X18 & X93
- 7401-04 to Ashington for X15 (2x left)
- 7529-33 & 7553-56 for X14/X20 (2x spare)

Remaining B9TLs could then be used towards X93 extras.