I have figured that Urho3D will be a good way to rewrite Lips of Suna for better performance and ease of modification. I have found 2 people on the Urho3D forums that are interested in Lips of Suna, which is interesting given how little I see here. A week ago, I started this topic on the Urho3D forums about this remake.
But I would love to have someone to jump in and contribute, especially to write the first lines. Given my inexperience in C/C++ or any complex programming, it would be very difficult for me to do the first step, and I will likely do a worse job than someone else.
The current task is to remake the [i[engine[/i] using Urho. Urho isn't a ready-made game engine, but it provides the parts to construct your own dedicated engine. The people I talked to on the Urho forums (the ones interested in LoS) believe that it makes the most sense to first make it work with the existing LuaJIT codebase of either LoS 0.5.0 or 0.8.0. Later on, I think it should be rewritten in Angelscript. Another early goal can be to recreate the main menu.
If you want to help with this first part, you can go discuss this on the Urho3D forums topic
https://discourse.urho3d.io/t/help-remaking-lips-of-suna-engine-with-urho3d/3396