Severely damaged evergreen (cyprus?) hedge.

I live in a block of flats where the gardeners failed to prune the hedges until they suddenly (about 3 years ago) went berserk and cut them back so much that large parts of them died off. The bottom part and top part are still alive but the middle section appears dead.
In my 70's, if the hedge were dug up and replanted (which I assume would cost a small fortune), I am not sure that I would live long enough to see it grow back to a proper hedge.
One of the residents of the block is threatening to spray the dead area with green fence stain. I have my doubts about this.
Is there anything that can be done to bring life back to the part that has died off?
Any advice would be gratefully appreciated.
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If a decision is made to replace the hedge, the best conifer for easy maintenance which does not mind hard pruning is Red Western Cedar, Thuja plicata. It forms a nice green screen and is relatively fast growing at 40 - 60 cm a year. I hope this helps.