From gimmick to identity: have Thresh's souls add rings to his chains

Imagine Thresh starting with 150 aa and flay range, and 200 hook range, then scaling infinitely (maybe a cap at 800 aa and flay and 1500 hook at like 50+ mins, indicatively Blitz's is like 900) as he farms souls. Is Thresh strong as a support with this change? Yes, he can do crazy gamechanging stuff late game. Is he still the "jack of all trades" that prevents anyone else from being picked? No, cause he has a shitty laning phase. He's good with a Vayne or Tris, not with an MF, or even a Kog. Is he viable as ADC? He scales ultra hard at the expense of his laning phase. Is he viable as a solo lane bruiser? If he gets a slight armor at lvl1 buff, yes. Is he viable as AP caster? No, this change doesn't address that, but I have a solution for that too: removing the AP from souls (maybe putting MR instead?) and buffing his AP scalings.

Remove the slow from flay tho. That's really overkill on that ability.