Can the new iPad Pro magic keyboard used on Dvorak? I wonder if it is possible to use Dvorak layout on the new Magic Keyboard for iPad Pro. It would be even better if I can use it without installing any third-party keyboard applications.

Also, on Mac I swapped some keys (; and ') but can I also swap the keys at my will?
Yes, you just go to settings/general/keyboard/hardware keyboard and tap over at the right edge and select Dvorak.