luceos I'm not sure, but Svelte might not create a virtual DOM like mithril Ford - and even if It did, it'd probably be structured differently (diff API).
You could perhaps try using svelte and custom HTML elements? Not sure if that'd work, but raw HTML is possible with mithril m.trust(...) and I use custom web elements in reflar/inject-mithril-components (or a similar repo name, I can't remember).