Convert the "is one of/is not one of" drop-down to a (minimal) set of two radio buttons.

This is somewhat similar to but not a duplicate of #1910186: Use an exposed filter as an on/off toggle for a filter...

I'm using the wonderful Better Watchdog UI module and I'm tweaking the view it offers to make it a bit more robust. One of the things I'm trying to accomplish is to replace the "Is one of/Is not one of" drop-down menu for the user field (an autocomplete field if that matters) with a small set of two radio buttons: "Is/Is not". Is there a way I'm missing that I can do that with the current version of BEF somehow?