Sometimes every single build combination is just not going to be uber-strong. Some weird combos might have to accept a little bit of weakness. That said, there are a few points:
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I doubt Bonemonger will get any new bonuses. It is actually almost too strong right now.
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There is this Apostate DW bonemonger set Aether melee with aether items, one giving a free autoattack skill. And this DW Bonemonger Opressor. Both have good aether melee weapons and no arcanist.
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Now if I were a betting type, I’d suggest that your best bet would be to come up with tweaks for the epic Mythical Conduit 2H sword.. Imho it’s unlikely that Crate will evolve a legendary towards your idea, but Crate is revising epic items in the near future. This sword needs a couple of things, mostly Attack speed. 45% conversion of elemental to aether would make this a perfect fit for the bonemonger set, but ehh…idk if that would happen…although I’ve never seen this sword used over any legendary for an elemental focus.
In this case you’d use bonemonger set + the conversion belt and you’d have mostly full conversion. In fact right now, if you can stomach only having 3/4 of the bonemonger set, you could convert ~75% of elemental to aether by using a different chest piece…as this 2H has a lot of elemental flat for conversion. You can use the Magelord epic ring set to convert 50% of elemental to aether.
But the majority of the aether RR is on the 4/4 set and you’d probably only be around 160% attack speed with devotions, not counting ghoul’s proc.