I wouldn't worry that much about hitrating.
There have already been found several nonsetitems with hitrating, like
Wodins Lucky Necklace or
Band of the Bone Colossus. A sword with hitrating drops (
Bloodvenom Blade and the set shoulders now also have hitrating (
Sanctified Shadowblade Pauldrons). And these are just the items discovered off 6 or 7 of 13 bosses.
I am sure there will be enough ways to gain hitrating up to the poison hitcap without socketing or even enchanting hitrating in any major way.