Since it is obviously too much of a stretch as duergar are evil and paladin class is good only. I wholeheartedly support rejecting a duergar paladin idea.

Wood-elf conjurer is bit of a stretch, but less so than a necro. However, it is more of a stretch than non-defiler mage classes invoker, shapeshifter and transmuter. Shifter probably has the best chances for getting accepted. Not sure if I want to see a w-elf conji in the fields, but invoker, muter or shifter is not too much of a stretch in my opinion.