As far as I know Ultimate Member doesn’t do anything to the bbpress profile. However, ideally I would like a digest signup to appear on the user’s main profile page, not the bbpress profile. Ultimate Member replaces the default WordPress profile page with its own, however it can be customized easily.
Although I am not a php programmer (asp.net instead), would it be difficult to copy your plugin’s digest configuration code (that the user interacts with) into a customized profile page that I create? Or, even slicker, would be a shortcode I could place in the profile page.