Explicit naming of devices in keyboard_grouping

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I have two "keyboard" devices. A set of 3 foot pedals treated as one keyboard, and a proper keyboard. I would like to use one of the pedals to act as my mod key, so that all I have to do is hold the pedal down and press a single button on my keyboard.

The "smart" default of seat <name> keyboard_grouping is not acting smart and treats them like individual devices despite every indication to me that their layouts are the same. This is incredibly inconvenient and makes what I want impossible.

My inputs, where you can see the layouts are the same for the foot pedals and logitech keyboard: https://pastebin.com/GRPRxtFA

I would like to be able to explicitly declare the two devices as a single group like so:

seat <name> keyboard_grouping <keyboardAIdentifier>,<keyboardBIdentifier>,[...]
where the identifier is what is provided by swaymsg -t get_inputs.

for example:
seat seat0 keyboard_grouping 1133:50501:Logitech_USB_Receiver_Keyboard,13651:45057:PCsensor_FootSwitch_Keyboard

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So I got what I wanted to do to work. The big issue was that any difference in xkb configuration immediately throws the device out of the grouping, and I was using xkb to remap the keys. Instead of using xkb I used udev's hwdb rules to do the remap, following this article (archive). I still think this feature request is valid though, since it really shouldn't take going to udev to have the devices play nice in a single grouping.