Junkyard Titan passive rework (or addition or whatever you would really call this idea)

So I'm a Rumble main and i really want to make him better because he's suppose to an engineer that made mecha out of scraps and parts he found in a junkyard. I thought of 2 reworks that could he and his teammates could benefit from:

Just so you know the heat management feature still exists as a matter of controlling Rumble.

-Whenever Rumble gets a finished item that he buys from the shop he can upgrade that finished item into a new piece of his mech suit, depending on what type of item it is. He would have 1 upgrade for each ability, but if you upgrade any of the boot items it would give him increased ms. The item the player would choose to upgrade would then make the ability slightly stronger than it was.

Example: Rumble finishes buying Rylai's Crystal Scepter , then a new upgrade opens up on top of the item tree, the player would buy it and that upgraded piece would take that slot. The effects of Rylai's would still apply to other abilities normally as well as the pre-chosen ability, but the item upgrade only slightly affects the damage of the one ability.

-The second rework to his passive Junkyard Titan would be that once he kills or helps kill an enemy champion Rumble can scavenge the body of the enemy champ for new parts to add to his mecha. One part per enemy champ and no more after different kills. Sort of like Rengar and Kindred's passive where they gain 5 stacks for killing each champion.

Example: If Rumble kills Darius the player has the choice of choosing either his Noxian Ax or his armor. If the player chooses the ax they would gain extra basic attack damage, but if they chose the armor they would gain extra physical defense. Each champion would give you different options, but there would be specific champions that had an upgrade to an ability. If Rumble were to kill Teemo the player would be given the choice between taking his mushrooms or his darts. If the player chooses the mushroom, the width of Rumble's R "The Equalizer" would extend by a slight amount (I'm an gonna give him extra dot damage, that would be stupid), but if they chose the dart Rumble's E the "Electro Harpoon" the length of the range would extend.

The champs that would give Rumble upgrades would be: -Annie (maybe) -Blitzcrank -Brand -Camille(?) -Corki -Ekko -Ezreal (maybe) -Heimerdinger -Jayce -Ornn -Enemy Rumble
-Urgot -Vi -Victor -Teemo -Ziggs (maybe)

Others can be added, but those are the ones that i can think of for now.

Every other champion just generally gives him extra stats to depending on what parts the player takes from the enemy champions.

I like the second version more because it gives him variety in each match he's put in. Also because I like to imagine Rumble attaching the different iconic weapons of each Champ on mecha either very well attached and implemented or just crappily attached on it with duck tape and nails.

I would like to see the different opinions about this.