I want to make trial fonts by swapping some basic Latin characters with similar accented characters.
For instance, at the export stage, I want to take A and swap it with Å, or Á, or Ą. Take C and swap with any based on C character—Ç or Ć. And so on.
So the word ACUTE will turn into ÅÇUTE with this trial font.
I suspect it can be achieved with simple glyph renaming, right?
How to do it technically? Can I set up it via ‘Rename Glyphs’ custom parameter? Or can I use fonttools and postprocess exported ttfs/otfs?
mekkablue
(Rainer Erich Scheichelbauer)
2
Yes. Does it not work for you?
It works, but not in the way I’d like it to work.
Since A is used as a component in all accented characters, like Â, Ã and so on, this substitution in Rename Glyphs
A=Aring
Aring=A
leads to the next result:
Which is understandable. But it’s not what I want to achieve.
I’d prefer glyphs that weren’t swapped to stay the same.
mekkablue
(Rainer Erich Scheichelbauer)
4
You only need one line of those two.
Oh, thank you. Anyway, the result is the same.
You can try a “GlyphsFilterDecompose” filter that includes all the glyphs that shouldn’t change.
That looks good. You might need to use a “PreFilter” if the filter is applied after the rename glyph parameter.
Hmm, something is still wrong.
Settings:
The result is the same:
There is better solution (specifically for that purpose): the “Decompose Glyphs” parameter.
Yay! It works!
I actually tried Decompose Glyphs parameter before the filter, and got no result.
It started to work only after a listed all the glyphs that use A as component.
Thank you very very much! 
