Dual Wield, Two (2) Two-handed scythes. Only Scythes.
How? Magic. Literally. They are an undead abomination held together by magical bindings. No reason why they wouldn’t be “strong” enough to do it, they have magic powering their corpse…
After all, flesh is so, sooo weak.
Why?
Well first, why not?
Second, why not?
Third, it would be cool and fun and makes sense within the lore of the games world.
everything you mentioned as being a problem, can be fixed by scaling. Which we already have in the game. The only thing stopping the devs is “we don’t want to”. Which is fine, but presenting new ideas is always good.
A few weeks before 1.3 I made a simialr suggestion, but it was allowing the Lich to use a 2H Axe in one hand when using a Off-Hand Catalyst in the Off-Hand.
Together with the new Hybrid Necrotic Melee/Spell Affix for axes this could allow some hybrid melee/caster playstyle.