@TheTechRobo already did some work in that direction.
Basically what's needed for an app, is a clear view of "/usr/share/X11/xkb/rules/base.lst" and the option to make a choice there, then implement that choice with either "setxkbmap" with no more ado or .... add it as the sole entry in "gxkb".
People wanting multiple layouts should be pointed to "gxkb" i.e it should be configured and added to .e16/startupapplications.list .... solely if they indicate that they want to have it.
