I had already tried what you describe but it doesn’t work well:
After killing the second wave you need a few turns to be on ranged so you only have 2/3 turns without enemy minions
The ranged minions are too far to aggro the enemy hero
You can see it on this replay :
Beside that, not pushing fast makes you very vulnerable to pull under tower.
About slow push I don’t know… I’ve also tried things like this (surely not as well as you describe, I’m not a Dota player so I’m not familiar with deny ^^) but the main problem seemed to be the poke from Ironman and the fact that it’s difficult to come with a big wave.
Anyway, I agree with the fact that diving is way easier to implement, so it’s not a problem for me if the anti-dive strategy is better than the dive one at top ranks.
Yeah, this is a really good community challenge. But there is one problem: How do we know what items are there to buy?
I suggest there should be some kind of list containing all affordable items, so that we have a inventory of items that we know we can buy. I feel this simplifies that segment of the game to a large extent.