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Hello, Is it a bad idea to try to replace Macbook Pro 2019 keycaps? Can it be done without damaging the switches?

There are two versions of the upper case which makes alterations tough. Your Slovakian system Slovak - (SL) uses what we call an ISO keyboard layout which is different than the North American (English) model. If you need a more US style of keyboard layout you could go with the English, Great Britain - (B) or English, International - (Z) version both are based on ISO keyboard layout. Here’s a breakdown of the different key layouts How to identify keyboard localizations You should be able to order a system online from the UK either Great Britain or English, International system. Your other option is to get stickers or a keyboard skin with the keys marked with the layout you want. The last thing here is altering the OS so the keyboard is reflecting what you are using. Here’s how How to Change your Keyboard Layout Mac OS-X

Yes the keys can be replaced. But you must be gentle and careful when removing and replacing the keys as there are delicate plastic clips on the underside of each key which engage in the scissor mechanism beneath and are easily broken.