Custom dialog styles (for borderless dialogs)

I'd like my scripted dialogs to have custom window styles to make them borderless similar to this UI Borderless: disable TitleBar and ResizeBorders

So I'd like to be able to apply custom window styling flags to the Dlg object before it's created

And a related more general question - is it possible to use some externally styled dialogs within DOpus? Like, I'm certain someone has extended these default windows controls "classes" with alternative styles, is it possible to find that "dll" or something and then ask DOpus to use that "class" instead?

Has anyone done something similar?