Have done this twice now, a very cool high ridge with some nice exposure. It's possible to keep it class 3, a bit harder in places if you stay on the ridge crest. Helen-Father D-Crystal-Peak 10 makes a fun traverse. Found some really interesting minerals up on Father Dyer's east ridge.
Fun ridge traverse, a little routefinding is necessary to keep the difficulty at class 3. Maybe had a class 4 move or two the way we went. This route is sort of like a mini-Ellingwood Ridge on LaPlata, similar route finding required. It would be a good warm up for someone interested in that route.