There’s probably a Plex add-on for Kodi. At least, there is for Jellyfin and Emby. If you don’t like the UI, try changing it. I prefer the one called “Arctic: Zephyr - Reloaded”. You’ll need to customize the homescreen a bit to get the most out of it. That way you can make it show widgets of your content, e.g. the latest content added, continue watching, specific libraries, etc. That, at least, works very well with Jellyfin through the Jellycon add-on.

… but would you like a cup of sea?

The “magic remote” from LG …

It’s so magic it makes you pay for a new remote with features that should already work on the regular remote.

But I get it. We’re talking groundbreaking features like navigating up/down/left/right, back and even selecting stuff! /s

The solution I found for my parents’ aging LG TV begging for a “magic remote” was adding an AndroidTV box with its own remote and an updated OS with an actual selection of working, relevant apps (as opposed to the native OS of the TV), for a cheaper price than a “magic remote” IIRC. Finally, replacing the default launcher of the AndroidTV box with the minimalist FLauncher made the replacement a somewhat less crappy experience than it initially was.