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If I trusted Revan, I would say that in the sewers, besides these five jerks + Augustus, there won't be any other NPC-like characters. In the end, even though Diablo was quite annoying, there were still two of them (him and the woman), which is a fair amount for a red quest. The ambushes by the homeless were also within reasonable limits.
The problem is that... sorry, but I don't trust him. Diablo was balanced more for Gungnir than for players. And Lok doesn't even have immunity anymore.
Overall, I'm more against it. I would like to check out one peaceful area, but it's risky, and most likely the slums have a separate sewer system, so let the musketeers play with their muskets there.