Simplistic solution to two problems
Scrapping Trident leaves a serious employment problem in Faslane and the surrounding area.
But the skills already there are in precision engineering, specifically small nuclear systems in portable pressure vessels. So don't shut down the yards; we need low-carbon energy. Retool to create a production line for small modular nuclear reactors.
Saves jobs. Keeps skills. Gives us things and expertise to export. Reduces our carbon emissions and our reliance on imported energy.
Doubtless this is overly simplistic. Any submarine engineers out there to point out why?