The upside is when  I looked at the leveling guide, there were a LOT of spots for evil factions, play that to your advantage! 
 
There's a couple neutral vendors so that's nice and some banks have tricks with LOS to let you bank even if KOS. Find those and check for hunting spots in the area. With invis and FD you got it relatively easy as a necro. There's probably more necro tricks I don't remember. I think skelly illusion makes you non kos in some cities? 
 
Worst case scenario you can make an alt with the right faction, xfer loot, sell it, buy gems and swap them back to main. 
		
		
		
		
		
		
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