Kovid, indeed, it was only several minutes for the first time. And your file with the embedded font is the prettiest doc I have on my reader for sure.
So I would love to master the art of doing this myself.
I did search my machine for the fonts to get to the command
any2lrf abelreng.rtf --serif-family "/Library/Fonts, Times New Roman"
- the font seems there, however, the outputfile is less than half in size of yours and clearly does not have the spec. chars.
I tried it on html and rtf - no difference.
Moni