I had thought about that, and might still do it. Some here were noticing there was still oil in the turbo after installing a CCV filter, most likely due to where the hose goes into the inlet tube and the excessive vacuum that would be created there pulling the oil through the filter.
I thought about the lower side of the air box, but would not ram air coming into the box, put pressure to the hose and into the crankcase?
I thought about putting it into the upper side of the air box also, that would prevent oil contamination of the air filter, but there is 2 air sensors in the top, and since I am not sure what they do, I would not want to contaminate them with oil. But, I might just try, what is the worst that could happen.
I concerned about where the hose exits now, just for the reason you mentioned (water crossings), I do off road my jeep and just a few months ago got high centered in a water hole up to the bottom of the doors. The bottom of the elephant hose would have been under water.
2008 CRD QDII, OME HD, Pintlers wheels with 265/70/17 Goodyear Silent Armour's, Jeepinbyal UCA's. 4XGuard Front guard, Side Guard, belly guard, Matrix HC. GDE ECO Tune w/ delete.