does anybody has ideas how one can switch keymaps on pre keyboard ?

I've tried this :

on simulator:
dumpkmap > pre.bkmap

then on linux maichine:
loadkmap < pre.bkmap
dumpkeys > pre.kmap

modify pre.kmap , say to display cyrillic-ya instead of q:
-keycode 16 = q
+keycode 16 = +U+044F

loadkeys -u < pre.kmap (on linux console I now can type cyrillic-ya instead of q)
dumpkmap > pre_mod.bkmap

take pre_mod.bkmap to simulator

then on simulator:
loadkmap < pre_mod.bkmap

and this does not work

Thank you.