I've been looking around in the kernel and I see mentions of RTL8189 on a bunch of allwinner boards, but digging deeper I can only see the USB driver, not SDIO, so WiFi will need the out of tree vendor driver. I avoid adding those in my images as they break all the time and in the mid-term once we switch over to iwd instead of wpa_supplicant none of them will work anyway.
The row of up/down/left/right buttons on the remote looks a little superflous with the round up/down/left/right/ok present too, so I wouldn't fret about those. I've marked them missing in the keymap and they can always be backfilled if someone else shares them later. I'm confident the codes for the 1/2/3 key in the embedded keymap are correct as the last two digits on other keys you captured and the amremote codes I can see elsewhere match.
Thanks for confirming the LED guesswork
If you update to https://chewitt.libreelec.tv/testing/LibreE…arm-10.85.0.tar I've reverted some patches which I think are the cause of the USB keyboard issue; please confirm back if that resolves the issue or not?