Ask HN: Is an unusual keyboard layout a problem when interviewing?

A couple years ago I've switched to the Programmer Dvorak keyboard layout with an additional remapping of Caps Lock to Ctrl. This has reduced the number of awkward hand positions when programming, especially in modifier-heavy software like bash and Emacs, but now that I'm starting my job search I'm having second thoughts. On Linux (X11) the layout can be enabled easily enough with one unprivileged command, but on Windows I'd need to install it or use a program called Portable Keyboard Layout which intercepts and translates keystrokes in real time; either way involves running an .exe on someone's computer. Should I use the time I have before on-site interviews to regain some typing speed in QWERTY, or just bring my own laptop and not worry about it?