I would not use Q-line. It's spectra with a sheath. Once you wear through the sheath it'll break. Also, it's thinner than the bridle lines.

Honesly, I would just get the replacement bridles because your time is worth more than what you are going to spend.

Rinse your pullies and make sure they spin freely EACH TIME before you rig... otherwise they will grind through your bridle in record time.