Poke Supports Are Shoehorned

It can feel like I'm shoehorned into getting a scarily similar build every game when I play a poke or Enchant oriented support. Ardent Censor, Zeke's Harbinger, and Banner of Command are the only AP support items outside of Frost Queen's. None of the other AP items outside of Zhonya's for Morgana fill a supportive role, and so I'm stuck with getting the "Power 3" almost every game (obviously getting Mikael's against cc heavy comps or Ohmwrecker for splitpush or against siege).

I don't profess to know what the item should be, though it should certainly take into account the archetypes of non-tank supports.

Enchanters:

They have Power Three of Ardent Censor, Zeke's Harbinger, and Banner of Command to fall back on. In addition, they may choose either of Frost Queen's or Talisman and gain situational benefits.

Poke supports:

Ardent Censor does grant damage earlygame, but it's outscaled hard when it comes to poke, and these champions don't have the kit to properly abuse its passive. Banner isn't bad as it benefits sieging, though Zeke's is probably the only way to go. The best poke item one could probably get on a support would be Abyssal.

AP Bullies:

They have access to the full repertoire of AP items, though at the core of that is Zhonya's. They're less of a support and more of a utility AP carry in the botlane, so everything goes, because none of the three supportive AP items work too well (outside of Zeke's).

I feel like poke supports get the short end of the stick here. While they do get Frost Queen's, their poke falls off so hard in the lategame if they try to build with their carry in mind. This is the kind of thing I believe would fix their weakness.

Komungu Blowpipe: X AP Possible CDR or even a slight amount of movement speed.

Unique Active: Bind with an ally champion Unique Passive: Damaging enemy champions with spells or abilities apply a mark of venom for X seconds. Your bound ally's auto attacks or spells consume that mark and weaken the opponent, granting you magic penetration against that foe for X seconds and dealing magic damage scaling off of your Ability Power.