Turns out Snowpack solves the problem partly, but it's an awesome project in itself. It has nomodule support too so it works on IE11. Check it out: https://www.snowpack.dev  https://twitter.com/frontsideair/status/1248175665909817344
Looks like there's a much better option: to use Pika CDN. It seems to be highly cache efficient and works with zero tooling. https://www.pika.dev/cdn 

I don't know how I missed that.
@pikapkg on your website you say that shared cache works but I read that it was going away[1]. Does the claim still apply?

[1]: https://www.jefftk.com/p/shared-cache-is-going-away
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