Older NUCs only support CEC wake; hence the other options are missing. It does HEVC/H264 so should be generally useable, though not sure about VP9. Adding CEC can be done with the Pulse8 adapter if they still exist or can be found at a reasonable price. I'd also look at learning remotes that replace the stock TV remote (nb: these days most TV remotes can learn too).
LE support for Rockchip hardware is mostly aimed at SBC boards. There is an image for a "Hugsun X99 box" but I wouldn't assume that anything found on Aliexpress is 100% the same (there are lots of clones) so it might work, or it might not. Rockchip support mostly depends on upstream activity too. RPi5 is lacking native emmc (although add-on HATs are appearing for that now) and VP9 but is the gold standard for LE software support, and it seems to handle 4K/VP9 up-to 30fps (not 59.94) in software fine. At the current time 4K GUI is not recommended on ARM boards (and most Intel H/W) even the HDMI output is technically capable as all Kodi skins are 1080p and the TV almost always does a better job of upscaling 1080p to 4K than Kodi does (Kodi needs to do it in software and this will noticeably slow down the GUI. CE probably has options but their approach to open-source software seems to involve not-always providing sources and deliberately using pre-compiled blobs; most users don't care, some find that distasteful and look for something else. I don't run it so cannot recommend it.