Sorry, Hunslet, only saw your question now about 6111.
With no others, it isn't possible to have an AEC set as such on the DCDR, though in theory 6111 could be paired with a Park Royal done up as a driving trailer, like on the Waterford & Tramore. Laminate brake genny 3223 has already been converted as a push / pull car there and is used as such at times.
However, the restoration of 6111 is an extremely major task, unlikely to see the light of day for many, many years. It was acquired as a long term project. It has no engine or control gear, this having been removed a long time before CIE withdrew it. Therefore, once restored, practicalities may dictate that it is used - certainly initially - as a push / pull car or observation coach.
Even the bogies would require significant attention, and the bodywork will need little less than a total rebuild.
But at least it's saved.