Hey y’all, I put this virtual keyboard together for UE 5.1+ recently. V2 is being published right now, and supports as far back as UE4.15! 
Hope this keyboard saves someone a lot of time. Message me any time with questions.
Virtual Keyboard for Gamepad V1 - https://youtu.be/gtnHlTBHoWU - Virtual Keyboard For Gamepad in Blueprints - UE Marketplace
V2 - Coming 08/29/23 at the latest - https://youtu.be/f_z3sZ5Vzqk