Just checked my Harvest era Bladefall/BB Chieftain in standard. Force respecced 50ish points, but didn't even 200IQ map the new points and it still looks viable. All rares (albeit Harvest era rares) with no AoE on them and it still is pretty good. Definitely feel the lack of AoE, but the real problem is it had .25 second cast time. Did a Catarina though and face fucked her, probably still easily in the 10-20m dps region. I'd say with 75% certainty you can make this build again and make it better.
It cleared like a fucking dream, but then I remembered I had a pre-nerf crit/curse/explode chest. So that's cheats, but with juiced Herald of Ash you'll still have some pretty good clear. Definitely felt like there weren't as many blades detonating at once, but the new helm enchant from few leagues ago would probably help with that (chance to detonate nearby blades).
Probably will play this, but was thinking of SSF this league so people don't ask me for bullshit nonstop early on. Finding a Thirst can be annoying, but I can still probably do it. Can just manually BB until then. The new Bladefall buffs will make clearing much, much easier and you'll only need BB for bosses essentially.