[Anatolis]

I know stamps can be created outside of MS as an image file (i used .png for the couple I've done, not that it matters), but I was hoping it might be possible to create, say, a text entry like "VS" which I use a lot, then make a stamp from it.

Hi Lawrie,

I noticed you are also a Tab X user. I can strongly recommend using instead of PNG images, vector-based images.
In example, I used Inkscape to type my note-text, save it as an *.svg and import that into MS as stamp.
I noticed that with PNG's and transparency layers, that I ran into some aliasing on my Tab X. And the benefit of the vector images: they scale super sharp in any size ;-)

Though indeed no solution like you want it: taking it from already created annotations. But perhaps vector pictures help in the mean time for sharper stamps :-)