I've used a light spray of 3Tsp/gallon Orthenex insecticide on my plants that have aphid or scale infestations. I've tried this on the more common plants (D. capillaris, spatulata, VFT, common pygmy sundews and some Sarracenia). So far, there has been no sign of tissue damage, even on new tender growth and when the crowns have been sprayed.
I haven't tried this on my wolly sundews, but orthenex has produced very satisfactory results so far (and the fact that it's a systemic is a bonus).
I'd try manually removing them or dunking under water for a day as a first line measure, but if this doesn't work, consider a very light spray of a dilute orthenex solution. I haven't seen any evidence thus far that this would kill the plants outright.
Good luck.