@peroty I created a Shortcut that allows the user to type in text that gets published straight to Micro.blog. Ideal for short posts. It needs to be tidied up a bit, has some superfluous leftovers from another Shortcut, but works.
As it is useful for a quick thought that I want to post, I thought that it would be great if I could access it from the Lock Screen. Enter Quick Launch which amongst other things, allows you to run a Shortcut as a Lock Screen widget.
So now I can press the icon for the Shortcut on the Lock Screen, am taken to a screen to enter text and from there to publishing it to Micro.blog.