I expect they will be comfortable (I wear M&S shoes a fair bit and find them lovely for my feet), but pp is right, they will not help to ease or heal the PF. If your current insoles are not custom fitted I strongly urge you to try them. They will also help a lot with cushioning for the arthritis and taking the pressure off your joints.
R&B shoes linked are more elderly looking and not trendy...nothing wrong with that per se....but saying that they’re less hideous and that M&S ones are a poor effort in terms of style isn’t correct in my view - they are closer to what is trendy right now and ‘younger’ looking (although I agree with pp that M&S aren’t usually quite on the button as far as achingly cool is concerned, but I imagine that’s not your prime concern here). R&B do beautiful shoes of great quality but with a cost to match, and more expensive doesn’t always mean more fashionable, trendy or stylish.
Anyway this is all so subjective.
These shoes will look good and you will pull them off perfectly fine, and to be honest your feet and your joints need comfort right now whether or not some people will hate the look. What’s important is you liked them enough to buy them (or were desperate enough to try them which is just as valid).
Wear them with pride and take the attitude that you look good and that will come through in how you carry yourself, which will make them look good.
I hope you get some relief soon.