They could always look into a minimalist framework like Svelte, which is intentionally the most minimal step up from plain JS/HTML in terms of coding, yet gives

They could always look into a minimalist framework like Svelte, which is intentionally the most minimal step up from plain JS/HTML in terms of coding, yet gives you the power to make React-level websites. I recently wanted to throw up some minimal stuff on S3 without building, just a HTML file, and was surprised at how small the difference was, for simple enough pages - almost 0.