I've got a similar behavior here. When I try your trick (both debian-installer/keymap=de and keymap=de), this layout is selected and available after the installation.
But it doesn't work with French keyboard ("fr" value for the options). When I restart the freshly installed wheezy, the keyboard layout is set to "us" in /etc/defaut/keyboard. Any idea ? Thanks -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org