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You'll have to machine a pre-combustion chamber into the head in order for the IDI injectors to work. They're not built to take the hammering that a DI injector will. Plus, you'll have to have a glow plug. I'm betting that with a loose engine and all the WD-40 in the world, it's still not going to start under 30 degrees. I've never actually seen how air injection works... never heard of it before.
Either way, I'm not trying to say it can't be done at all. You can probably do it with enough time and enough money. I guess it's just the German Farmer in me that wants to over-engineer everything. If I build something it's because it's going to be better than I could buy it or so much cheaper that I can deal with all of it's crap that I'll have to put up with.
Anyways, it sounds like you have a pretty good idea of what you want out of this engine, so I'll just leave it at that. Have fun!
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