Hey, thanks and glad to hear the marimo + anywidget combo has been an unlock (I'm also the creator of anywidget). Clearly I'm biased, but custom widgets are a powerful primitive (marrying web & data ecosystems), and it's exciting to see coding tools making it even more accessible to build them out for specific or one-off tasks.
Re: deployment, we hear you & stay tuned. You can provide input here [1].
Side note: if you're curious, I have an RFC out for widget composition (widgets within widgets) [2]. Should be shipping soon.