Some tank balance, rework Sunfire, from a Shen main

Remember back a year or so when Sunfire got changed to be mostly a pushing item and Thornmail was the go to "I want to duel" item, but Thornmail ended up being broken? So they decided to revert Sunfire to being the core go-to item for boths dueling and pushing and nerfed Thornmail. But now, no one is building Sunfire anymore, the item is useless. Tanks have Banner If they want to push and Sunfire is garbage in a 1v1 scenario. So If Banner is the tank pushing item, I think we should change Sunfire to be more duel oriented. Maybe something like removing it's Passive damage to minions completly and adding some 10% cdr on the item. Maybe remove the passive completly but add some shield mechanic, old colossus. And i have this QoL change for Thornmail: Make thornmail applie GW in a small area rather that when being hit. Right now only Shen and Rammus really use this item without problems.

I know, I know, tanks shouldn't duel, but that should be the rule only for lategame. If I am Shen vs Irelia i know you will destroy me If we meet on a sidelane at 3-4 items. But if we both have 1 item it should at least be close. Tanks need some sort of 1st buy dueling item in order to not get destroyed.

PS: I hate Titanic rush on Shen, but I do it couse there is no other way. Titanic should be 2nd item, like every other champion that builds Hydra.