I've tied some on a loop of monofilament for wiggle nymphs. It works and would work for extended bodies (just tie it down to the hook instead of looping it through another piece of mono). However it is a huge pain in the neck to tie on 7x mono. As an extended body wouldn't need a loop of line Mason hardline could be subtituted. It wouldn't be all that stiff, but it beats supple 2 pound test.

For larger patterns I have used foam for extended bodies.
Good luck.

Warmouth