How to only use the modal step?

[deakjahn]

My intention is to use SmartSelect inside a customized DropdownButtonFormField (mostly because the number of entries became too large to normally handle, so your grouping and searching features would provide real help to my users). However, this calls for a slightly different approach, as the dropdown button only needs the modal part, because if provides its own frontend. Also, it uses a fourth layout, neither popup, bottom sheet nor full page, it has a specific route added that fills the full width and grows to somewhat less than full height (practically leaving about two rows' worth of space for easy dismissal).

So, the question would be if you could suggest the best approach or, if necessary, do you consider it feasible to add whatever support is needed for this use case (a new layout, as a minimum)?