Rumble chilling

Not sure if this known already, but I have seen literally noone ever do this, so I thought I would mention it. I literally thought of this today.
There is a well known Rumble tech that mostly applies for support, where you get the ability haste rune shard and start E. By timing it properly, you can get to around 70 heat and then maintain it by using the ability off of cooldown. This makes it easier to hit a level 2 overheat if needed, but is usually used for an instant overheat the moment you hit 3.
Enter the new tech: Keep ability haste rune shard. Game starts, you buy 2 glowing motes and sit at base. By spacing out your Es properly and then spamming them once you are left with just 1 charge, you can get 140 heat at around when minions spawn. You then undo your motes, buy support item + pots and spam E while walking to lane, maintaining the 140 heat. You time your level 2 with 110-120 heat and at level 2 go E flash Q ignite at the opponents with nimbus cloak and try to run them down with your overheat. This is something you would do at level 3 usually, especially if you had hexflash approach and wanted to trade summs, but now you can do it at level 2.
I don't play Rumble support anymore since Q nerfs, because I was more of an E max player and rank 1 Q got giga nerfed and I assumed the pick is way worse and never played it again, so I haven't actually done this cheese, but I'm inviting all you Rumble mains to try it. I did ,however, go in practice tool and test how much heat you can get if you do everything properly, just to be sure.