[Thematic Update Idea] Heimerdinger 2.0, TDS(Tower Defense Simulator)

An idea i had on updating Heimer is on is upgrade ability, not as a lame upgraded basic abilities ult, but as his new passive. Heimer would scale with levels as each time he would get a point in his ult (6,11,16) he could choose one of three upgrades for his abilities. He only gets one upgrade per ability, but could upgrade his q, w, and e, in what ever order he decided, and choose one of two to three upgrades to each ability. Since these upgrades last the game, they would be less overall powerful than his ult versions, but he could easily get smaller more build path-y boosts that could be more impactful the longer the game drags on. his turrets could get a small scaling bonus, a small bonus to turret speed for CDR, or a health shield that regens every so often that scales with mana, allowing heimer to be more divrse with his builds but not make those stats useless. His rockets could get an upgrade to cryo rockets(added slow), Hyper Kinetic Rockets(added physical damage and rocket speed), and Rocket barrage(plus extra rockets, but is channeled instead of strait burst). Finally his grenades could be Cryo Blast(removes stun for bonus AOE and stronger slow), Blaze Blast(removes stun and slow, but causes ground to blaze), and Storm Blast(removes stun and slow and reduces AOE, but if it hit an enemy unit it will bounce three separate bolts upto 3 unique targets(each bolt keeps track of different "unique target" lists, so a unit could theoretically be hit by Storm Blast a maximum of three times)).

TLDR; Even if rioto doesn't use the ideas for ability upgrades that i listed, making upgrade his passive and getting augmented abilities based on emphasis of either damage or utility, would be a good way to stick to his TDS(Tower Defense Simulator) theme.

Of course, i have absolutely no idea what to replace his ult with, just preferably not "Oh, bigger Turret, Bomb, or Rockets!" They are just one use better basic abilities and it's lame and unoriginal. I will give them that it fits his theme as an inventor, but what genius invents the same one-off improvement that has one use over and over again. I'd like to think his inventions are more "tailored" to each match, making him inventive and, more-over, adaptive to his environment(as the true Grade A Genius Inventor that he is should).