On Linux, you can have different keyboard layouts for different physical keyboards. How? Easy!
Just add a line like this:
SUBSYSTEM=="input", ACTION=="add", ENV{ID_SERIAL}=="046a_0011", ENV{XKBLAYOUT}="us,ru", ENV{XKBVARIANT}=",winkeys", ENV{XKBOPTIONS}="grp:shift_caps_switch,grp_led:caps,terminate:ctrl_alt_bksp"
to your /etc/udev/rules.d/zz-local.rules file (create it if it doesn't exist).
Note that I haven't tested it under SystemD or Wayland. Sway, it seems, supports it natively!