Changing outline ttf. font to single stroke (engraving) font.

Hi, I am looking for ways to convert ttf. standard fonts to single stroke fonts for my pen plotter. If I use standard fonts then text is with empty side and doesn't resembles handwriting (my purpose is to use my plotter to get as close result to handwriting as possible) Maybe someone can point me in right direction. Thank you! 

Regards
Viesturs

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