"So, while you can create a theoretical hedge instrument, the application of such an instrument is untenable as a profitable hedge in practice"
There is an infinite amount of hedges that can be created with synthetic financial instruments. Some instruments haven't been invented yet and even if they have been invented you have to convince somebody else to take the other side of any trade. Credit default swaps, options and just about any other instrument were new, unproven and potentially secret at some point. Right now there could be somebody who has figured out a way to do some kind of time horizon hedging and is going to make bank when some startups do/don't IPO.
I actually think it's quite likely.
Edit: Having read some of your other comments on here I would rephrase my answer as this: why would a time-horizon hedging strategy be any less successful than any other hedging strategy?