Description of bug or feature request

I am working on a feature for the select element to make it filterable with an input element. The idea is to allow an input element to filter out options in a sibling listbox element.

This explainer goes into detail for filterable select and another feature called "customizable combobox", which is a separate feature I am going to work on afterwards: https://open-ui.org/components/combobox.explainer/

Is there any good or bad ways or examples of implementing this pattern? If we just say that the text field controls the listbox in platform a11y mappings (like aria-controls), is that enough?

If the select element is a button which opens a dialog containing this text field and the listbox, is it ok for the select element to still have a combobox role?

Will this require a change to CORE-AAM?

Probably, but the HTML structure is still under debate: whatwg/html#12050

Will this require a change to the ARIA authoring guide?

Unknown. I'm not aware of an aria practices guide for making a listbox which can be filtered by a text field.