@kaywhyn: you're not quite to the intended solution but this is pretty close. This is partially due to an error I made - when I was adjusting the skillset for the new solution, I had a few leftover skills, and I thought I removed them, but it would appear that I did not. In any case, it's certainly not an egregious backroute. Since I had meant to remove the blocker, I'm going to release a patch, but if you successfully modify this solution to work in v7, which will be released sometime today or tomorrow, I will consider this to be an acceptable variant (the only changes will be the removal of one blocker and one walker from the skillset, if you want to start working on a solution before then).
To be fair to eric, many of his levels are certainly on the easier side, but there's not necessarily anything wrong with that, though his suggested fix didn't really fit the vision I had for the level. The pack I've slowly been working on needs more easy levels and more hard levels, but at the end of the day I'm more comfortable pumping out the easy levels if I need more to balance out the difficulty, so I don't want to lose a potential late rank level to difficulty-reducing backroute fixes. I might look into your fix a bit for the future, though - I probably won't apply it to this level, but I might make a new level with it.