Keep dreaming. They’d be too busy complaining about dirt under their fingernails to learn anything of use in nature.
I wouldn’t think Undead Paladin would be out of the question. Xera (before being reduced to glitter) showed us that the Light can completely purge the presence of other sources of magic from someone. If a Paladin was a potent enough vessel of the Light in life, I see no reason they would be unable to restore that connection regardless of how they were brought back.
Void Elf Paladin would be much more difficult to resolve since VE has been explained as the character actively seeking to wield the power of the Void. If a Paladin felt the need to seek out another source of power it would be very difficult to not see that as a lack of faith in the Light.