A besieged NM pops to the south of the area (Gursomething the Menacing, or such) which is true sight, but you'd have to make a real effort to actualy aggro that in your way to zone (1). Mirror guards (which are NOT true sight) are positioned north west of that room. To aggro them you literaly need to go afk while auto walking, as you can easily just hug your left as you do the U turn.
The NM might have a big walk radius, so you could just kill him before you start, it's not like it's hard (that's what we did, "just in case").
Personaly, i'd stick with zone (1), but to each its own.
(Side note: People need to stop being afraid of using melee =/ )
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