Had some cowboys forced upon me by circumstances and time. Unfortunately I've got a situation that I can't do much without a radical rethink

After some building and electrical work I needed some plastering done to walls which were previously plastered (40 year house with plaster over internal block construction) Some of the walls  were in perfect shape other than some raggling that had taken place to allow some additional lighting. other walls had been knocked through or disturbed in one way or another.

The resulting plasterwork on the previously plastered walls was like the Himalayas and the others were not much better. Areas around wall outlets (which had been removed for them) were barely recognisable as being finished off. The grounds and door standards have been left set back from the finished surface between 3 and 8 mm in places.To give me something reasonably flush  to stitch facings/skirtings I'd have to redo or pack out the grounds and door standards to allow further remedial plastering (is there no end to this). The exposed corners  complete with angle beading look as if they've been plastered with a radius in mind  and not a finished corners.

The ceilings? I have boarded them again with a view to taping and skimming, and this should be a suitable solution.
But I still have the problems with the walls. Do I get somebody to plaster over the existing mess? (most decent plasterers are reluctant to look at someone else's work - understandably). Or, is there no option but to remove the lot and possibly create more damage?
To compound the problem I'm in a part of Scotland (PH1) where plastering has taken a back seat to taping and filling over the last 30 years, leaving out of practice roughcasters to throw the stuff on inside.