Composite Channel 1 = Hotkey 1 + A/D
Composite Channel 2 = Hotkey 2 + W/S
Composite Channel 3 = Hotkey 3 + [LEFT]/[RIGHT]
Composite Channel 4 = Hotkey 4 + [UP]/[DOWN]
Composite Channel 5 = Hotkey 5
Composite Channel 6 = Hotkey 6

To make it easier for some people here,
i once designed a circuit that will save most people reading this guide a lot of time and make it as easy as possible for you to implement this technique in your creation.


As you can see, it already contains some useful features and can satisfy the needs of almost everyone.
The circuit already works when only one seat, an antenna and a toggle switch to change the mode is connected, in this case even without a numeric keypad or a constant numeric value block.

Here the circuit: https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2242987688

To understand the circuit better here is a creation to get to know the functions.


The link: https://gtm.steamproxy.vip/workshop/filedetails/?id=2242984311

Tip:
As already mentioned by @MaHuJa the "occupied" signal from the seat can be used to switch between the modes, just connect the "occupied" signal from the seat to the mode input and set the default mode to radio.