[Xorg] xkb usage with multiple layouts

[Viktor Kojouharov]

is there any way to use these layouts together: us,bg,jp. some layouts, like us,ru,au or other combinations can be used together, according to various sources. however, upon trying to switch to us,bg,jp, I get an error: 

saturn_vk at sat:~$ setxkbmap -layout us,bg,jp -variant ,phonetic, -v -v 
Warning! Multiple definitions of keyboard layout 
Using command line, ignoring X server 
Warning! Multiple definitions of layout variant 
Using command line, ignoring X server 
Applied rules from base: 
model: pc104 
layout: us,bg,jp 
variant: ,phonetic, 
options: grp:ctrl_shift_toggle,grp_led:scroll 
Trying to build keymap using the following components: 
keycodes: xfree86+aliases(qwerty) 
types: complete 
compat: complete+leds(scroll) 
symbols: pc(pc104)+us+bg(phonetic):2+jp:3+group(ctrl_shift_toggle) 
geometry: pc(pc104) 
parse error: line 1 of pc 
The XKEYBOARD keymap compiler (xkbcomp) reports: 
> Error: Error interpreting include file "pc" 
> Exiting 
> Abandoning symbols file "default" 
Errors from xkbcomp are not fatal to the X server 
(EE) Error loading keymap /var/tmp/server-0.xkm 
Error loading new keyboard description 

I know for certain that these different keys can be used together. A cheap hack is making one of the three inputs as a third level, however it's not pretty, and it's not anywhere near perfect. Is there another way?

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