Years ago in the pre GPS low cost era 1999, I did Isolation in the winter. The hike in was completely socked in and the ice storm/lack of blazing made following the trail not very easy. When we did the Engine hill bushwhack we somehow got on a low track and then corrected ourselves. When coming back we decided not to follow the broken out trail and went high ending up a few hundred feet above the Engine hill col. That route put us in some nice open terrain, somewhat rocky but with even better views than the traditional bushwhack. One these days I need to go check it out again as it may be nice place to be in the summer.
On that same trip we "nailed" the lesser used bushwhack route that leaves directly at the end of the engine hill bushwhack to the col just north of the summit, lots of nice open slopes and occasional ledges and mature woods for most of the trip. If it wasnt for the last 1/8 of a mile up to the col (whihc is dense spruce/fir), it would be a good summer route. The next time I did the route I went too high and got caught in far nastier stuff.