Does changing my keyboard void my warranty?

Hi, I was wondering could someone advise me. 

I'm planning to purchase a new XPS 17 9710 but in the "build your own pc" section on Dell's store, there's no option to customise or select a US International keyboard instead of the standard UK one. Why aren't options available? However, If I browse the Precision workstation variety, keyboard choices are options! So it's not like Dell doesn't have stock.   

Due to muscle memory, I find the standard UK/Irish keyboard not especially friendly considering every other keyboard I own has a physical US International layout. I was therefore wondering. Would it be possible to contact customer or tech support and ask them about making some changes?? i.e swap the keyboard in my build? 

Alternatively, IF I were to purchase an OEM keyboard and change the keyboard myself, would this void the warranty on the rest of the system (excluding the keyboard/trackpad) since those are available elsewhere.