Holy crap guys Hexblades are simultaneously the best and the worst ever. I can barely even explain how this build I came up with works but I'm reasonably confident it does.
The trick is using the Gloom Pact Weapon, which naturally has reach, combined with a staff implement, and then replace the pact weapon with a transcendent ki focus. Staff Expertise adds +1 reach on melee attacks using the staff, which the Hexblade at-will technically does. Transcendent ki focus adds +1 reach on melee attacks using the ki focus. That turns it into reach 3, which is quite impressive. Furthermore since you're making an implement attack using the staff you can also feel free to benefit from the property of an Accurate Staff to make up for the Gloom Pact's lower proficiency.
The Gloom Pact Weapon is a flail, so there's also a lot of nice, saner hax you can apply to that.
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"[This is perfect. I have always fought with these kinds of cards. You say that I have lost the moment I was dealt? It's just the same as always!]"