You might have been better off purchasing a Honeywell device with a dedicated built in keyboard like a CK62 or CK67.

https://automation.honeywell.com/us/en/products/productivity-solutions/mobile-computers/handheld-computers/ck62-rugged-mobile-computer

I don't know if I would personally trust a keyboard accessory in a rugged industrial setting even if one did exist. 

Shouldn't you be able to plug-in any USB-C keyboard?

Or just (if it's one device per keyboard) think about a BT one (so just need to be close to it instead of plugging it in).

There should be a keyboard that you can plug in.
In our warehouse, it's better if it's permanently connected, even if it makes the device bigger.