I'm doubting ancient coin as a viable choice
Can set up your movements to be more predictable to pick up the coins, which grants additional zoning power to the enemy laners, allowing them to possibly gold starve you significantly more than the old bandit+ancient coin combo.
https://i.imgflip.com/m36dg.jpg
How about every time you get hit per x seconds, the attacker drops a coin, so tank supports are rewarded for being the meat shields they're meant to be?
Your allies can pick up the coins for you, so if you did your duty and tanked all the damage, allowing your ADC to pick up the double kill they can pick up your coins after sweeping up.