There must be a lab in the state capital that can process the film dip and dunk for you, if not even closer to you. Have you tried the Yellow Pages for a local lab? If nothing else, "word on the street" is that when Wal-Mart receives medium format film for processing, they send it to an honest-to-goodness Fujifilm U.S.A. lab for processing. If that really is the case, it couldn't be that bad of an option.
Not to stray off topic too much, but I would really not use Ektar for senior portraits, unless it is going to be purposefully contrasty and saturated. Heck, I don't even like it for most landscapes, where many people seem to love it. I like it for certain still life pictures (purposefully garish ones), and that is about it, for the most part.
Additionally, the process for Ektar is no different than for any other color negative film. It should name the process right on the backing paper or film cassette, so lab techs know what to do with it. Based on threads here on APUG, many lab owners seem to have told customers that it needs special processing, but this is just not true. So, while I definitely recommend quality professional processing, it does not need to go to a special lab just because it is Ektar.
I am also not sure medium format is warranted by the situation. I think 35mm would be just fine. The quality of modern films is outstanding; 35mm can be pushed quite far. And let's face it: yearbook printing is not going to be top notch anyhow. It will mask any advantages medium format might have.
It helps to filter all color films, even negative ones, in off-colored lighting. But because Ektar is contrasty and saturated, it is even more important with this product than with many other color neg films. For light open shade, I'd at least use one of the heavier 81 series filters. For deep shade, I'd go all the way to an 85+82 filter combination. Overcast weather will play hell with this film too.