This happened to me a couple times over the years... or to my skis, when someone Less experienced was driving. I found it best to take off the intake grate. Working thru the grate was frustrating and time consuming. It comes off pretty quick with I think 4 bolts, and it was my older 2007 ski, and I had no problem getting the bolts out and the grate back on. For better or worse, I didn’t put any sealer on the bolts or anything, just put it back on. That was years ago, and no concerns have occurred since. If you have some rope caught tightly between the impeller and wear ring, hopefully you have some rope to hold and pull to get it out. You might be able to slide it towards the leading edge of the impeller, where there is more clearance between the impeller and wear ring, and pull hard to get it out. I was always able to pull my rope out or slide it out that way, towards the leading edge. if you have already cut all the rope away and have nothing to hold and pull, I don’t know what you do... I would probably get a long screwdriver and carefully try to push the rope towards the leading edge of the impeller, carefully not damaging the wear ring. If all else fails... it is nylon rope...burns and melts quick...maybe I would get my little propane torch and quickly hit it to melt it and still try to pry it towards the leading edge of the impeller... Being careful to not heat the wear ring too much or the seal area? Then turn the ski over until it is loose and comes out? Just an idea. i don’t think I would just start and run the ski though, which is your current idea.