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Like @Andy m I'd say don't bother. All you will get is a slightly different noise, no more power, and people will wonder why you stuck an Akroprovic on an NC.......

Welcome to the forum. Don't. Noise makers are anti-social and the NC sounds like a washing machine regardless. There is no more power to release, Honda designed it to run like a Diesel, efficient but charmless. If you want more go and a more traditional sound the only effective way is another bike. Andy

You should be doing exactly this at each tyre change, if not once a year. However, if the previous owner or dealers monkey has not kept up to things and the corrosion gets ahead it's a piston kit job. Eventually you will still need the kit just through wear. Caliper pistons have certainly suffered from the ban on real chrome. You have something that is in contact with brake fluid, very salty water and a heat cycle. You'd struggle to come up with a better way to create weird oxides. Andy

Don't panic about getting air in NC brakes I changed several callipers and changed my own rear master cylinder never had an issue or had to use anything but the simple bleed system I am yet to find a Honda system that is hard to refill or bleed even teh four channel combined linked ST1300 systems bleed easly The same cannot be said for some European bikes!