To give this a bit of a bump..
So far what I can think of as possible is expanding Thatcherite ideology towards industry in a more 'industry friendly' way, ie actual industrial policy rather than letting it crash and burn, with the rug pulled out and intense competition from high interest rates meaning a survival of the fittest situation which led to 25% of british industry collapsing between 1979-1980.
Something to note is the government went ahead with labour agreed pay rises in 1980. Inflation reached 22% as a result. Not honouring this agreement (I find it somewhat bizarre it was honoured considering Thatcher didn't seem to care regardless and monetarist ideology was specifically for a school of hard knocks approach) would likely reduce inflation in that year somewhat.
Something of a carrot and stick policy could be adopted, otls harsh measures as the stick but extensive tax breaks on new machinery, equipment and techniques, adopting german style training and adopting William Demings approach on quality management to act as something of a carrot. Its likely a lot of british industry will still die (small problem of little finance due to the extremely high interest rates) but it'd nonetheless be a policy more friendly to industry that plays ball with the new competitive game.
New business schools and tech colleges etc could also help.
Would implementing Barbara Castle's "In Place Of Strife" helped?
I don't think so, things were already well out of hand by 79, and many trade union reforms
were implemented during thatchers era (some were of course specifically to curtail union power but likes of secret ballots etc were brought in, and were actually popular among many members, rarely leadership however)
Part of the reason for the willingness to let old heavy industry die and replace it with the service industry was
A) usually lower paid jobs (at least initially) which meant less inflation
B) new sector was less trade union dominated, and new TU laws and regulations would apply immediately when TUs were formed.
One area I'm interested in is finance, London was one of the financial capitals of the world and the financial industry would boom through the 80s, benefitting from the 'Big Bang'. Woudl there be any way to orientate even some of the immense financial power wielded back towards internal investment in industry?