get rid of base support items. Make Sightstone the base item:
Sightstone 500g
Hp: +100
Gold: +2 Gold per 10 seconds.
Active: Place a sightward. This item holds 2 charges and refills when you back to base.
Now add items for it to build into that based on your build path. Kind of like how EVERY jungler has to have smite and jungle item to succeed. Every support should have a sight stone.
Tankstone (place holder name... Make it GREEN!)
Build Path: Sightstone (500g) + Cloth Armor>>>Chain Vest (800g) + 500g (1800 total)
HP: +400
Armor: +40
Gold: +3 Gold per 10 seconds.
Quest (Execution): Execute minions below X health and share gold with nearest ally. Can hold 3 charges.
Quest Reward: Gain a Shield that regenerates while out of combat. Executing minions reduces this cooldown.
Active: Place a sightward. This item holds up to 4 charges and refills when you back to base. You may hold down the active button and consume 2 charges to instead place a control ward.
Mage Stone (place holder name... Make it BLUE!)
Build Path: Sightstone (500g) + Amp Tome >>>Aether Whisp (850g) +450g (1800 total)
HP: +150
AP: +40
Movespeed: +6%
Gold: +3 per 10 seconds.
Quest (Claim): Damaging an enemy champion grants you X Gold. Only procs 1 time for dots. holds up to 3 charges. Put charge up on cooldown for 6 seconds for each minion you kill.
Quest Reward: No longer put Claim on cooldown for killing minions. Every so often, your next damaging attack against an enemy champion will reveal them and slow them by 30% for 1.5 seconds.
Active: Place a sightward. This item holds up to 4 charges and refills when you back to base. You may hold down the active button and consume 2 charges to instead place a control ward.
Ruby Sightstone (Make it re... yeah...)
Build Path: Sightstone (500g) + Ruby Crystal/Rejuv Bead>>>Crystalline Bracer (650g) + fairy charm x2>>>Forbidden Idol (800g) + 50g (2000 total)
HP: +500
HP Regen: +100%
Mana Regen: +75%
Cooldown Reduction: +10%
Gold: +2 per 10 seconds.
Passive: +10% increased Shielding and Healing power.
Quest (Healer): Each time you Heal an allied champion, or block damage to an allied champion with a shield, gain X gold. Can hold up to 3 charges, similar to claim, goes on cooldown for 6 seconds (stacking) if you kill enemy minions.
Quest Reward: No longer goes on cooldown for killing enemy champions. Gain an elixir that grants you one skill point.
Active: Place a sightward. This item holds up to 4 charges and refills when you back to base. You may hold down the active button and consume 2 charges to instead place a control ward.
Just ideas :P