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I'd say a linguaphone kit of some description to get a GM AAR Multiple unit system on the 111s to talk to the TDM system on the MK2 DBSO via ex Southern Region Class 488 Gatwick express Multiple Unit trailer cars!!!

The simplest method of push pull is I.Es system where the MK3 control cars are basically constructed using spare standard GM loco cab parts such as Notch Controllers brake handles etc. The loco and control car communicate using standard AAR jumper cables the length of the train and effectively the loco thinks the control car is another locomotive. This system is the system already on 111-113
TDM is a system devised by BREL in the 1970s/80s which allows Loco control signals to be passed through standard MK1/2/3/4 train lighting cables thus allowing most carriages to be suitable for push pull working witout major mods. This system is already on the DBSO.
Southern Region stock communicate using 27pin jumpers I think but completely different to the AAR jumpers and located at High level away from where the electrified 3rd rail would have been.

The choice of which system to go for is NIRs but to me its a no brainer go down the AAR route and fit the 8 coaches and the DBSO with AAR jumpers that way any 201 can also work with the set giving a standard job alongside the De-Deitrichs which are AAR fitted, and if I.E are sneaky maybe we might see a push pull fitted 111 on a MK3 push pull before they visit Gwent Demolition!! That would be incredible a Blue GM pushing orange carriages!!