@festlicheameise you might try approaching conservation builders or #conservation orgs. For example English Heritage regularly use blacksmiths with historic building skills, and conservation builders like https://www.hallconservation.com/ use #blacksmiths and #metalworkers for a variety of bespoke work. I can't speak to wages or length of contracts, but it's interesting work!
https://www.english-heritage.org.uk/
https://buttress.net/services/conservation too - nice people!