Force Input Source about karabiner-elements HOT 5 CLOSED

My config to restore Force input source is:

• BetterTouchTool(BTT) with triggers for shift down -> shift up sequence to prevent any shift + letter misuse. -> remap to {"⌘", "⌥", "⌃"} + [ and ] accordingly.
• Hammerspoon to force keyboard input source:

local hyper_super = {"⌘", "⌥", "⌃"}
hs.hotkey.bind(hyper_super, "[", function()
    hs.keycodes.setLayout("Russian - PC")
end)
hs.hotkey.bind(hyper_super, "]", function()
    hs.keycodes.setLayout("Australian")
end)

Works smooth.
BTT config attached
btt_config.zip

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Im trying to implement https://github.com/tekezo/Karabiner/blob/65e286b42e2c36d15683c828a8574e873ad4bfe6/src/core/server/Resources/include/checkbox/languages/russian.xml

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I think overlaid modifiers aren't implemented yet. ;)

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not sure why would I need to shift down -> shift up sequence to prevent any shift + letter misuse
otherwise works perfectly.

UPD: in betterTouch it is important to set "required" checkbox for "Cmd-Up" key (which clear by default)

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