Ask HN: What software stack to select for my project (a modern retro computer)?

I need your advice in selecting the software stack for an educational, boot-to-code computer. The computer will be an AIO with a keyboard, screen and a Linux board with just-enough CPU to run the coding environment.

The intent is that eventually in the future to turn the computer in a commercial product that will come bundled with a coding book that will teach coding to young audiences and enthusiasts. E.g. a modern-retro computer. Below are a few mockups and even a possible ad:

Pic1: https://pbs.twimg.com/media/FqZl4tNWAAEVICB?format=jpg

Pic2: https://pbs.twimg.com/media/Fo-QP-MX0AEOjUJ?format=jpg

Pic3: https://pbs.twimg.com/media/Fo-QP-PXEAIGSn4?format=jpg

The computer will offer a simple coding editor, a language (TBD) with a nice API for drawing shapes, put sprites, etc. on a graphical canvas.

Now, back to software stack that will power the coding environment (editor, menus, etc.) and a language interpreter (e.g. JavaScript).

Main requirement from software stack is to run on a low-powered Linux SBC and boot in under 5 seconds to coding environment.

I’m considering the following options:

1. Dart + Flutter + Skia (no X)

2. C# + Avalonia + Skia (no X)

3. Kotlin + Compose for Desktop + Skia (no X)

4. Pascal + Ultibo (no Linux)

5. C + LVGL (no X)

6. Vala + GTK (Linux w/ X)

7. HTML5 (Linux w/X and Chromium engine).

What do you recommend?

P.S. Looking forward to your recommendations regarding features of the coding platform. My intent is that experience to be similar to fantasy consoles (but high-res) or to codeguppy.com environment.