Thanks for the feedback Peter, I haven't ruled it out yet, I'm going to see how the nylon clips I've ordered work out, if they can keep the original trim in place without masking the paint I'd prefer to use those. I think I want to use original parts where I have them and they're in good condition but I'm happy to modify other stuff so there's little originality left when I identify something I want to modernize or replace!
Off to Gerry's again next week for a week or so, this time I'm taking my wiring notes with me to progress that aspect, unfortunately the Simtek loom didn't turn up at Malvern last weekend but I hope to collect it soon and have further discussions about what else it can do and what it can't!
Guy