What kinda buffs does Pantheon needs to be a toplaner again?

I really miss him playing as a toplaner, after all, that's my main lane and Pantheon was the first champion I ever played. Even after the rework, I kept playing with him and had so much fun for a while, but sadly in his current state, he is a kinda weak pick for top. I thought of some nice buffs for him, and honestly, It could be interesting if one of them could actually be tested in PBE at least

1 - Make his passive give him a small shield/heal if he hits an enemy with a stacked ability (like Xin Zhao, Yorick or Gragas)

2 - It could be interesting to make Pantheon's ultimate be a two casted ability, like Twisted Fate for an example. His first cast could be either immediately fully stack his passive or during a short period all of his abilites will be casted as if he had his passive stacked, then during a specific time he could ult again to cast Grand Starfall to roam.

3 - Maybe add a small number of %health damage in one of his skills, for example, if he casts his E with Mortal Will effect, he will deal an extra 1% Max HP dmg per tick.

4 - Last but not least, make his W scale with AD pls (Maybe his ultimate too, but this is just me getting greedy e.e)

Well, I think one of those buffs could help him to not to feel that helpless during the late game, maybe make Pantheon be a cool pick in the toplane again (which I really miss e.e) and even help him deal against Tanks/Bruisers better. What do you guys think? :D