Eh, I think the lv 1 Rogue strategy is more of a gimmick thing even in normal circumstances. In a vicious or vicious+vicious dungeon it's incredibly sub-optimal, especially since you could just prep Yendor for instant level 5. Moreover, a lv 10 Goblin Assassin is going to have better stats all around and will also have an entire dungeon's worth of popcorn to get piety from Tikki Tooki, so he can pull off most of the same tricks as the Rogue only with far more resources. (Granted, a Goblin Assassin doesn't do much "normal" leveling either.)
For comparison, the alpha's Boss Hive has level 2 Meat Man with 4 attack and 90 HP. And the alpha had far more broken strategies available than the current game.
			
		


 Took a hacked scout through Super Vicious Gaan Telet.  The monsters end up with about the same damage, they just hit the cap earlier.  Horatio still had 5000 HP, but his starting damage doubled from 75 to 150, and when enraged, was 215.  I think that a Monk with maxed resistances and the Vampiric Blade could do it, but that's about it.  You would probably want the Really Big Sword too. BYSCEPS is good too, but doesn't help as much against all of those 150 damage Goo Blobs and Wraiths you'll be facing.
 Took a hacked scout through Super Vicious Gaan Telet.  The monsters end up with about the same damage, they just hit the cap earlier.  Horatio still had 5000 HP, but his starting damage doubled from 75 to 150, and when enraged, was 215.  I think that a Monk with maxed resistances and the Vampiric Blade could do it, but that's about it.  You would probably want the Really Big Sword too. BYSCEPS is good too, but doesn't help as much against all of those 150 damage Goo Blobs and Wraiths you'll be facing. It's definitely doable, at least. This time 'round I did Mystera (everything but Refreshment) -> Earthmother (Plantation/Clearance to finish off form #2 and then a bunch of Vine Forms) and then picked up Scholar Pact right before heading down. Snagged a WEYTWUT, and I think the 6 MP WEYTWUT / 5 MP BURNDAYRAZ / BLUDTOPOWA (with Battlemage Ring and Flames) might be the way to go on form #4. Even in its nerfed state, BLUDTOPOWA is incredibly helpful, just so you have something to do with your health that doesn't involve trying to tank ridiculous hits.
 It's definitely doable, at least. This time 'round I did Mystera (everything but Refreshment) -> Earthmother (Plantation/Clearance to finish off form #2 and then a bunch of Vine Forms) and then picked up Scholar Pact right before heading down. Snagged a WEYTWUT, and I think the 6 MP WEYTWUT / 5 MP BURNDAYRAZ / BLUDTOPOWA (with Battlemage Ring and Flames) might be the way to go on form #4. Even in its nerfed state, BLUDTOPOWA is incredibly helpful, just so you have something to do with your health that doesn't involve trying to tank ridiculous hits.