@Kymberly The closest to a solution I know of is to tie temporary heddles using loops of thread (many floor loom weaving books have examples of how to tie one-off heddles). Then you can move the mis-threaded warp to those temporary heddles and remove them once you are done weaving.
@kyle brilliant, thank you so much!
That’s probably what we did - using crochet cotton to extend an extra (cut) texsolv heddle and tied it into that spot. *phew*