have you tried creating those key in the registry?
Second option, download the KbdNop.dll driver on a PC and look into it with an HEX editor... you may find which Registry Key it's really using.
Third option, ask to MK3190 PM you can find his/her name on the PMB
I created the following registry key => P1 - TRIG01 = "KeyCode"=dword:0040 (see figure below) in branch HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\KEYBD.
I want Function Button 1 of my MK3190 to generate the @ (asciii 0x40) when pressed.
Then I made a "Warm Reset" of my MK3190.
In Microsoft WordPad of the MK3190 when I pressed the Function Button 1, I see it is still mapped to the up arrow key.