That should work... Not sure why it doesn't... maybe we need to do some command-line diagnostics here.
~ $ bt-kbd-remap Int: (3) Ext: (4) --- Setting ext keyboard layout: setxkbmap -device 4 -I -I/usr/share/X11/xkb-chinook -rules base -model pc105 -layout us -print | xkbcomp - :0.0 --- setxkbmap -device 3 Trying to build keymap using the following components: keycodes: evdev+aliases(qwerty) types: complete+nokia compat: complete symbols: nokia_vndr/rx-51(common)+nokia_vndr/rx-51(us)+inet(evdev) geometry: nokia(nokiarx51)