See you space cowboy...
Nope, there is no alternatives to the VTM-4 fluid whatsoever. My guess is there isnt a market for a aftermarket fluid of that type since it would likely be for Honda only. I don't know of any other Awd systems like Honda VTM-4 and Sh-Awd.I use Honda fluid in the rear diff, too. I'm sure you probably have a cheaper alternative to that, as well... but I'm still gonna use Honda fluid.
The ATF if different. It's not like Valvoline is mixing atf in a bathtub, calling it "multi vehicle" and selling it. They do there own R&D like every one else. Use whatever fluid that makes you comfortable and fits your needs. Its mostly quality stuff these days. Essentially, just service your Pilots transmission frequently with a quality fluid and you'll likely extend the life of it. Skip a few too many services and you'll likely pay the bigger price.