I -think- it should be fine... on Kodak's Motion Picture site they say that (at least for 100D in 35mm and 16mm) that it's more or less the same as E100VS.
"Q: Which 35mm still films match the technology and performance of Ektachrome 100D, 5285?
A: Good matches are the Kodak Professional Film E100VS or the consumer film, Kodak Elite Chrome 100 Extra Color."
You should get an image though, even if the colour is different.
edit: this is what I'm assuming based on what the films share in common, I do not know the difference between VNF and E6, there's not much info around on VNF.
In any case list of VNF processing labs:
http://motion.kodak.com/AU/en/motion/Support/Laboratories_Directory/vnf.htm
edit2: okay found a somewhat relevant reference (finally)
"Officially, VNF in E6 will give you bad results. Unofficially, the only difference is the time and temperature of the second developer (the color developer) need to be modified."
http://www.cinematography.com/index.php?showtopic=32641
If you can ask an accomodating E6 lab to double the colour developer time (its a process to completion), perhaps you might be all good?