I am working on a set of SVG tools and importing 2 large libraries to TW5 - FontaAwesome5 & GameIcons.net. I don't have a demo wiki up yet, but based on the existing FontAwesome plugin demo-wikis, I think a config tiddler where you can filter/display icons & drag them off to a sidebar to "package" them will be the main feature of the demo wiki.
The other side of it is actually CSS based to make the inline/translcuded SVG code match the stock TW5 icons. Still working on that... it might end up as a global macro, so you could use the icons in other size/color/etc instances elsewhere, but call them as "system icons" with `<<.icon ""title">>`.
I will make an announcement once I have a basic demo wiki up.
Best,
Joshua Fontany