Even assuming the wurm was single pulled and you had unlimited room, I really doubt anyone (with Velious gear) could solo a guardian wurm, even with the right clickies and gear. Shaman won't be able to slow without tash, enchanters can't slow without malo, and no way any melee would stay alive against them. Maybe a shaman with a real lucky proc of tash right off the bat, then kiting it while debuffs land would work.
Honestly, the best chance is probably monk or warrior with lots of clicky heals, but even that I doubt is doable. Even though they only have 32k hp and double, they hit fast and hard.
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