Making control+key combos act the same with different layouts

[bogorad]

I use two layouts in win10 - Colemak-dh for US English (called U_BASE), and U_QWERTY for Cyrillic. What's the recommended way of making ctrl/alt/meta+key combinations act the same regardless of the current layout? I'm pretty sure I'm not the first one with this problem :)

The idea I'm considering is to just map UNICODE symbols for each Cyrillic char and use one layout in win, but it's an ugly solution.

UPDATE2: Thanks to brilliant suggestions by locknload762 I realized I need to change the behavior of the modifier:

(defalias
  qwe-ctl (multi (layer-while-held U_BASE) lctl)
  qwe-alt (multi (layer-while-held U_BASE) lalt)
  qwe-met (multi (layer-while-held U_BASE) lmet)
)

[gerhard-h]

I believe pressing control + (unicode c) is not regitered as C-c by the OS.
but you can use switch to send another non unicode letter if a modifier is pressed
you have to use it anyway because you have to handle shift for unicode.

(switch
 (lctl rctl lmet rmet ralt lalt) a break
 (lsft rsft) (unicode Ä) break
 () (unicode ä) break  
)

it's lengthy but not ugly. There is the brand new deftemplate feature (template-expand kyrill a ä Ä ) looks pretty nice.

[locknload762]

Using fake keys for temporary toggle to the QWERTY (ENG) OS layout and then back on modifier key release can be a solution.
I'm using such solution toggling to Sym layer holding Space with temporary toggling OS layout to ENG then back on Space release.

(deffakekeys
  fk_swe (macro A-S-2) ;; Win shortcut to ENG layout
  fk_swr (macro A-S-1) ;; Win shortcut to RUS layout
)

(defalias
  tgsym (tap-hold-release $tt $ht spc  
    (multi 
      (on-press-fakekey fk_swe tap)
      (layer-toggle sym)
      (on-release-fakekey fk_swr tap)
    )
  )
)

[bogorad]

So instead of moving around keys, we just alter the behavior of the modifier! Brilliant, thanks.

[locknload762]

May be more optimal/reusable would be just toggling to base layer

(deffakekeys
  fake-ltg-bas (layer-toggle U_BASE)
)

(defalias 
  qwe-ctl (multi 
            (on-press-fakekey fake-ltg-bas press) 
            lctl 
            (on-release-fakekey fake-ltg-bas release)
          )
)

[locknload762]

Or even without fake keys at all :). Like qwe-ctl (muti (layer-toggle U_BASE) lctl) if fake keys are not usable elsewhere.

[bogorad]

Indeed, this is a much better way, more thanks! Will use with ctrl/alt/met!