Sveltekit now has an option that allows inlining everything.
"We now have the ability to generate fully self-contained apps with the bundleStrategy: 'inline' option. Together with Vite’s assetsInlineLimit option, it’s possible to put an entire SvelteKit app — code, styles, fonts, images, audio and everything else — inside a single .html file that you can share with people on a floppy disk."
Announcement: https://svelte.dev/blog/advent-of-svelte#Day-22:-self-contained-apps