@Kovid
OK. Thanks for setting the record straight. That was an unintended misunderstanding of mine.
What's your opinion about pyftsubset (and fonttools)? sherman was complaining about the scarcity of documentation.
The fact that I do not know how to do it now, does not mean it cannot be done tomorrow using a technique similar to the one Kovid uses. The processed list is just an argument feeding pyftsubset and does not disqualify itself as a subset tool.