I'm no insurance expert but since none of that stuff has in any way altered the performance, I doubt they would have an insurance impact. If any company tried to invalidate your insurance during a claim citing something like a change of interior light colour, I'd get straight on to the ombudsman. Certainly, no company would take notice of any of the things you've listed as regards the value of any pay out. I have modified and declared in the past with my MG Maestro 2.0 which had a 16v head fitted along with upgraded brakes - that had a small impact on my premium and it was something I had to remind them about when they wrote it of with a frankly insulting offer. Never did get what it was probably worth but got double what they initially offered.