I'm not going to search for a means of inserting diacritics in words that have become everyday English words. So, for me, it's cliche and naive.   

I would never write or type "CD'S". If I were absolutely forced to use block capitals for the construction, I'd refrain from using the abbreviation at all. I can't think that it's an issue that's going to crop up very often.

Speaking of form-filling, I never see the need to write anything on a form in capitals except for my name and address. I regard it as exceptionally rude to be asked to do otherwise. Similarly, I don't see why I have to go searching for a pen that writes in black ink. Of course, if there was a risk of losing money I might feel obliged to comply under protest. As for forms that make you write one letter per tiny little box, they are the most ridiculous pieces of bureaucratic nonsense in all creation. If an employee of mine devised such a form I'd sack him!