Have fun selling your stakeholders

  <select multiple

Also, don't forget that if you want to submit the values with something else than a GET wirh URL params or a POST with formdata mimetype for the body, you'll need JS anyway.

You can use it as backing for some JS component though (visually hidden), this is often done to have components work accessibly and with maximum interoperability. And to get functionality and tests right without implementing complex ARIA standards perfectly and running into constant issues with vanilla form submits (see above) or focus states and a11y.