Hi Jens,
another trick for automation with MessChess can be to duplicate the standard mess.cmd into two additional versions, such as mess_kishon_mute.cmd and mess_kishon_narrator.cmd.
Create as well two .lua files named and edited accordingly, in addtion to the standard kishon.lua.
Edit your dedicated .cmd files and before the line launching the MessChess.exe insert a copy from either your kishon_mute.lua or kishon_narrator.lua to kishon.lua.
Now you can duplicate the engine in your GUI and assign the corresponding cmd.
When starting the engine, the expected .lua file will be enabled thanks to the copy upon the standard one, before lauching the emulation.
Just pay attention to the path to the plugins/../interfaces directory for the copy command you add in the .cmd files, and it should work.
Hope this helps,
MfG
Eric