Count me among the surprised that a home cannot be found for them. I know this site is especially contrarian ("Idiot! There is no stock for X, and of course this excess stock won't work on Y!") - but even as shorter units, I would have thought something might work.
If they are knackered, then a shortened set or two might work on not too intensive electric service - say the Abbey Line? Or a medium distance electric service like Birmingham to Liverpool? But those now interwork. Or something NW like Man/Liv to Blackpool. Hell, even a local shuttle from Crewe to Preston, much proposed.
There is a surplus of EMUs (some of them quite decent) coming off lease at the moment and in the next few years - hence it is unlikely that anyone would be interested in a small, fairly non-standard class which needs work.
If there was a shortage of EMUs it might be different, but at the moment there isn't, and won't be in the near future.