I've really not yet had any success. The plugin seems to stretch out the original where I'd like to just bend the original rectangle into a spiral with the height and the length being in the same proportions as the original. No doubt a lot of this is my ineptitude with PAINT.NET. I am immensely grateful that @MJW has done this work. Hopefully I can make it work well enough, ultimately.
Here are some images of what I've tried so far.
This is what I started with:
That's a rectangle and it was on a square canvas. I couldn't even get anything worth pasting here to show, but everything was stretched out and mostly invisible in the rectangle.
I tried squashing up the image:
and then this was the best I got:
and this is not usable.
As before, I'm a complete novice at this sort of app, so no doubt it's VERY possible I've made some rookie errors.
In terms of timeline, ideally, I'd like to submit my score on Monday 30th for the poor musicians who are going to workshop it on 7th Dec. My final project has to be submitted on 9th. It'd be so cool to submit a neat spiral score. (I can otherwise bodge something in Powerpoint I guess or maybe even handwrite.)