Refer www.jefferypsanders.com/autolisp.html
In this folder there is a simplex.txt 136kB
Jeffery P Saunders is offering this font free and has a modest charge for others.
I hope/assume it will be extrudable and lower file size than the hollow swiss fonts I have modified as per looking at suggestions by drew and bfane for example in the acadmdt folder accessed from the MDT page.
Quote from website:-
*This program creates "ballooned" simplex characters with polylines.
*Each character is a separate entity.
*You can select a text entity to convert or you can select an insertion point for new text.
*This font is free and hatchable.