Hi Nick,
I think you should post the bitmaps (with explanation) to the end of your
existing MM&TT thread for comment. Make it clear that while there is a hint of a curve in the right flags for the font, everything can still be just straight lines when handwritten.
If no-one finds any problems, then we can go on to add outline versions of them to that .ttf font. I'd be pleased if you were interested in learning to use FontForge to do this yourself. I'm happy to fill in any gaps in the FontForge documentation, give feedback, and do some final finessing of the outlines. Or I can do it all, but it may take me many weeks to get to it.
The component parts are not accessible to the outside world (they don't have unicodes), but are only used to create the fully-fledged (or perhaps fully
fletched ) symbols. To see these, use View->Goto->U+F028.
Yes, you would start by adding the two new components — the 1,2,3-stackable version of the right scroll and the 3-stackable version of the left barb. The other three components already exist — the single left scroll, the 2-stackable left scroll and the shaft.
To create the new components, you would paste suitable 8 ppss bitmaps into a background layer and create smooth outlines over the top of them. You could copy existing right-scroll and left-barb outlines and modify them. Then you would create the 12 new symbols as various combinations of those components, and then create the downward symbols as flipped references to the upward symbols, for a total of 24 new symbols. Then we would convert these from TrueType (at 2048 units per em) to Type 1 postscript (at 1000 units per em), fix up any rounding problems using Douglas' script, add them to a renamed version of Bravura, and make this font available on the Sagittal website. Getting them into SMuFL and hence into the
official version of Bravura, will take much longer, possibly years.
I agree with your earlier assessment, that there is no prospect of making sensible multi-shaft or X-shaft versions of these symbols, so Stoic will remain a strictly Evo notation, with no Revo extension.
Since these "Stoic" symbols are an alternative form of "Athenian" notation, it occurred to me to wonder whether the Stoic school of philosophy originated in Athens. Indeed it did! "The name derives from the porch (stoa poikilê) in the Agora at Athens decorated with mural paintings, where the members of the school congregated, and their lectures were held." from
https://plato.stanford.edu/entries/stoicism/. So the Stoics were indeed alternative Athenians.