Style Picker / Swatch Space to facilitate copying or "painting" styles

Noted while working with Styles in GR5 that there is frequently the need to cut and paste styles (colour, font settings etc) across different elements. I've noticed the workaround is mainly to copy/paste the rgba colour values from a text editor.

What I'd really like for colour settings is a paintbrush style swatch space where you can save specific colours and drag/drop them to colour entry fields, like this:

A similar picker for font and text settings would be great as well.