Is it possible to have Lua(La)TeX produce a document where the text in the output PDF are "stroked/filled paths" instead of "selectablecharacters/words"?
Yes, you can get the glyph contours from luaotfload.See for an example how minim-mp implements metapost’s `glyph of` operator, in the file minim-mp.lua, under the section ‘glyph contours’ (you may need get the most recent version off ctan).
