How to assign a keyboard shortcut to each keyboard

I use at least four keyboards -- US normal, US international, Indian Devanagari and Indian Tamil. I would like to assign keyboard shortcuts to each of these individually so while typing US normal I can shift to US international without reaching for the mouse. Back in Windows where I use Keyman (http://tavultesoft.com) I have this facility. Please tell me how I can assign individual shortcuts. The KDE Control Center Keyboard Layout dialog has some stuff called Switching Options and Xkb options but they do not seem to contain what I want. Thank you. -- Tux #395953 resides at http://samvit.org playing with KDE 3.51 on SUSE Linux 10.0 $ date [] CCE +2006-02-10 W06-5 UTC+0530