Same issue here with R-Go split
Interestingly I found one configuration that works, but horribly breaks other 
things:

first, have a look with xinput

$ xinput 
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
...
⎜   ↳ Hantick USB Keyboard Consumer Control     id=20   [slave  pointer  (2)]
⎜   ↳ HID 0911:2188 Consumer Control            id=22   [slave  pointer  (2)]
⎜   ↳ HID 0911:2188 Mouse                       id=24   [slave  pointer  (2)]
⎜   ↳ Hantick USB Keyboard Mouse                id=25   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
...
    ↳ Hantick USB Keyboard                      id=16   [slave  keyboard (3)]
    ↳ HID 0911:2188 System Control              id=17   [slave  keyboard (3)]
    ↳ HID 0911:2188                             id=18   [slave  keyboard (3)]
    ↳ Hantick USB Keyboard System Control       id=19   [slave  keyboard (3)]
    ↳ Hantick USB Keyboard Consumer Control     id=21   [slave  keyboard (3)]
    ↳ HID 0911:2188 Consumer Control            id=23   [slave  keyboard (3)]
    ↳ Hantick USB Keyboard Wireless Radio Control       id=26   [slave  
keyboard (3)]


The Hantick devices as well as the 0911:2188 devices are the R-Go Split (why so 
many?)
interestingly there is a wireless radio control???
Anyway, let's create a new group

$ xinput create-master rgosplit 0
$ xinput
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
...
⎡ rgosplit pointer                              id=27   [master pointer  (28)]
⎜   ↳ rgosplit XTEST pointer                    id=29   [slave  pointer  (27)]
⎣ rgosplit keyboard                             id=28   [master keyboard (27)]
    ↳ rgosplit XTEST keyboard                   id=30   [slave  keyboard (28)]

and now add those 0911:2188 keyboard devices to it (note that you need
to replace the numbers in the commands)

$ xinput reattach 17 28
$ xinput reattach 18 28
$ xinput reattach 23 28
$ xinput
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
...
⎜   ↳ Hantick USB Keyboard Consumer Control     id=20   [slave  pointer  (2)]
⎜   ↳ HID 0911:2188 Consumer Control            id=22   [slave  pointer  (2)]
⎜   ↳ HID 0911:2188 Mouse                       id=24   [slave  pointer  (2)]
⎜   ↳ Hantick USB Keyboard Mouse                id=25   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
...
    ↳ Hantick USB Keyboard                      id=16   [slave  keyboard (3)]
    ↳ Hantick USB Keyboard System Control       id=19   [slave  keyboard (3)]
    ↳ Hantick USB Keyboard Consumer Control     id=21   [slave  keyboard (3)]
    ↳ Hantick USB Keyboard Wireless Radio Control       id=26   [slave  
keyboard (3)]
⎡ rgosplit pointer                              id=27   [master pointer  (28)]
⎜   ↳ rgosplit XTEST pointer                    id=29   [slave  pointer  (27)]
⎣ rgosplit keyboard                             id=28   [master keyboard (27)]
    ↳ HID 0911:2188 System Control              id=17   [slave  keyboard (28)]
    ↳ HID 0911:2188                             id=18   [slave  keyboard (28)]
    ↳ HID 0911:2188 Consumer Control            id=23   [slave  keyboard (28)]
    ↳ rgosplit XTEST keyboard                   id=30   [slave  keyboard (28)]

Now I can type with both keyboard halfs simultaneously in a gnome-terminal!
But when I switch to other applications, e.g. firefox, only one half can type...
Maybe someone can build up on this?

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https://bugs.launchpad.net/bugs/1777708

Title:
  Desktop briefly becomes unresponsive when typing on 2 keyboards at the
  same time

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