Actually that's my configuration of choice, being Spanish, I use a UK keyboard + AltGr and it's perfect. I find the UK layout more comfortable for programming, and still can type Spanish when needed.
This is just the same for me in Norway. The Norwegian layout has open curly brace on AltGr + 7, which is very painful when programming. US with AltGr is so nice, but it just makes me more of a weirdo up here..