Vince Liuice (https://github.com/vinceliuice) is a prolific GTK Theme creator - you may have read about his latest theme on omgubuntu - https://www.omgubuntu.co.uk/2018/03/canta-gtk-theme-rounded-corners
What do you think about his latest theme? https://github.com/vinceliuice/Canta-theme ?
How compatible is it really with Budgie - can you give it a try?
Is it worth investing a bit of time creating a “Theme Makeover” in budgie-welcome?
If yes - what would you suggest for the font - font sizes - cursor type - icon-set - panel size - panel shadow on/off