The keyboard filter only blocks the Windows hot keys. Probably best to create your own onscreen keyboard solution.
Removing keys from on screen keyboard

Brian Tabone
46
Reputation points
We have a Windows 10 IOT Kiosk application that will be used primarily in a touchscreen environment. We want to remove the emoticons (and possibly limit other keys) from the on screen keyboard, is that possible?
Accepted answer
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Sean Liming 4,141 Reputation points MVP
2020-05-28T16:29:32.43+00:00 0 additional answers
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The default keys are the hot keys that can be set allow/block: https://learn.microsoft.com/en-us/windows-hardware/customize/enterprise/keyboardfilter-key-names. The documents say you can create custom keys so in theory you could get the emoji code and have it do nothing. I have not tested the feature. At least, this give you another option. Before Keyboard filter was available, I created a keyboard filter service that would block hot keys. The trick is knowing the VK code. There might be tools out there for this.
Regards,
Sean Liming