I just tried this out in a custom game with just me. He definitely doesn't need a leash, the 3 turrets by themselves can handle blue. You MUST tank the damage with EVERY camp. A lot of the time my positioning was off and I almost died. Unfortunately that leaves you constantly half dead, but his passive makes sustain horrid but not impossible. I got blue and wolves and backed for trailblazers, managing to get red and level 3 at 4 minutes in. I was then able to barely clear the rest of the jungle (needed to smite the raptors), back again, clear again, and finish my AP enchantment at 9 minutes. It's not exactly viable, but actually his turrets do enough damage that I don't think it'd be a complete fail. You would need to E perfectly on ganks and then ult+w, but, like ww, you could probably only effectively gank when your ult is up.