Change highlight color for deadkey previews (like accents: `´^¨) in terminal app

I've been tweaking the theme / color preferences in the Terminal.app a bit, after a while I found that when pressing a diacritical mark/accent/dead key there's a **highlighted yellow rectangle** showing a preview of the accent you're inputting. Here's an screenshot: It turns out is not editable from the terminal preferences. In fact it seems like a system wide setting. But it IS incredibly annoying to guess what it is displaying with a dark background + lighter text color in the terminal app: Is there anyway to change that yellow color to correctly read those symbols no matter what text/background color is?