[kody]

Flask + Svelte is very accessible. When my Middle School students wanted to "build an app" I would roll up a boilerplate with Flask, Svelte, and SQLite on Replit (would not recommend anymore - Replit has jumped the shark) and they were able to become very productive very quickly.

EDIT: this was after 1-2 months of intro Python and JavaScript, so they weren't going in blind but also didn't have to learn, say, React. If you know some Python, you can use Flask. If you know some JS, you can use Svelte.

[makeitshine]

I'd say just go with SvelteKit, then only a single language is needed (plus html and css). The downside being they'll not really gain a firm understanding of the front and backend split.