Oh I know a use for it but it means some radical changes...
From the 460, remove a TFO TCO and TSO from each one, giving 24 'Trailers'
From the 458s, remove the PTSO from 8 of these, replacing each with a trailer from the 460, we now have 16 spare trailers and 8 six car 460s. With pantograph cars, add pantograph, send to run routes off Manchester Airport that are of a reasonably long distance.
We also have 16 spare tailer cars. Now, depending on what route the 460s end up on, they could either remain within them, keeping 460s as 8 car units, they will fit in Manc Airport, but not Manchester Oxford Road or the Bolton Corridor, so Liverpool may be an option. Or, insert these into some of the 458s...
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In that case why not add pantographs to 8 of the 450s (making them 350s) and use the ex-Gatwick units on SWT services and release the converted 350s to LM, who can them release their 321s to another operator for extra capacity?
Or this...
Or if heathrow airtrack comes about and is 3rd rail, they'd be ideal for that.