cuberite VS LeviLamina

You might be able to port a C/C++ implementation to Arduino or another language with a good ESP compiler, but that's going to be a lot of effort, and the biggest challenge you're going to face isn't RAM, it's disk space--Minecraft worlds can be GB in size, so you'll need to pair your microcontroller with, say, an SD card reader and then adapt a whole disk IO system

Shout out for Cuberite as an alternative Minecraft server project that desperately needs more volunteers

https://github.com/cuberite/cuberite

"Cuberite is a Minecraft-compatible multiplayer game server that is written in C++ and designed to be efficient with memory and CPU"

Cuberite has been demoed running on old ARM Android phones and hosting multiple players off it at once. Its performance absolutely annihilates the Java based 'vanilla' server

so basically Cuberite but more officially and with a rewritten client as well

Some have started doing this already, like Cuberite and McPy.

For minecraft server I guess it is worth trying this out: https://github.com/cuberite/cuberite

For the server you should look into Cuberite, same thing but for the server and written in C++.

There were a bunch of attempts in the past. Cuberite is still actively maintained but I have never tried them: https://github.com/cuberite/cuberite

I was forced to go with a native version since most of my friends didn't even have a Xbox account or forgot the password and Geyser requires that so I ended up going with LiteLoaderBDS

LiteLoaderBDS is an unofficial plugin loader that provides basic modding support for BDS, with convenient APIs, lots of utilities and powerful script support. Writing plugins in C++, JavaScript(NodeJs), Lua, C#, Python(WIP) and other languages, which allows developers to easily extend and customize BDS functionality.

Pocketmine, LiteLoader, Nukkit...

Hers the eng plugin downloads: https://github.com/LiteLDev/LiteLoaderBDS/discussions/categories/plugins

There are other mods like LiteLoaderBDS(https://www.litebds.com/). but BDSX is more productive I guess. but if you don't really care about vanilla features, PMMP can be best.

Well https://github.com/LiteLDev/LiteLoaderBDS is a plugin loader for bedrock edition that supports2 different types of plugins also https://github.com/zhkj-liuxiaohua/MGPlugins and https://github.com/zhkj-liuxiaohua/CSRMods are some plugins which need to be compiled to run though almost everything isn't in english and is somewhat complicated so make sure to have something ready to translate the text.