Did you try a normal USB ir receiver? That's what I used to use before I got my Android media box with BT remote. Worked very well across a few different versions of Kodi / OpenElec / Ubuntu etc. on my Pi over the years.Because of the scarcity/ horrible prices of RPI boards, I bought one of these to use as a Kodi box.
https://www.robotics.org.za/RAD-PI-ZERO-1GB
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