Preview Highlighter Shortcuts?

Has anyone had any luck figuring out how to configure different highlighter colors in Preview via kind of shortcut? I've had difficulty getting it to work, in part because the highlight color options do not appear in a menu, but only as an option from several icon clicks. Would ideally love to both a) have the ability to place them on a custom touchbar config and b) use a shortcut or trackpad gesture to cycle through the colors. Any ideas?