I just released my ‘Publish Quote’ shortcut version 1.0:

This shortcut provides a quick and easy way to publish a quote from a Safari webpage, with or without commentary, to Micro.blog. Just select the text you want to quote, hit the share button in the toolbar, and run this shortcut. It’ll even send a Webmention if you add your own comment.

Learn more, see it in action, and get it here from the HeyDingus Shortcuts Library.

Thanks @gr36!