My cheap and cheerful fix was simply to rub down the worst of the bubbles, then stick this
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F172942499073
over the top. 22mm width, with two lines of adhesive tape on the back. It bent naturally to the right profile, easy to cut to shape with scissors, and now looks like I paid a fortune for a set of chrome waist seals. Well pleased.