How would the rangers be able to identify Nym? they would know Omo, but no one would be certain who he was running with, and Omo never encountered the council at all
It's not like everyone in Yicelafo is trying to escape Elf Country right now, and even if they were they wouldn't be heading towards the Land of Marauding Necromancers. Once they've realized we're gone (which may or may not take a while- we're not exactly known for our Legendary Social Skills) and they get reports of two elves (one of them a deserter, and I'm sure it wouldn't be hard to identify Omo as being our best friend, as it seems like he's the only one we really hang around with/know in our hometown- plus, wouldn't it be possible that they'd think we talked Omo into deserting when it was practically the other way around?) running the border only a few days after our disappearance, it won't be hard for them to put two-and-two together.
We can communicate with the bear well enough to get it to go to the Ranger Camp, I'm pretty sure.
But can we keep it from causing too much damage? Can we communicate to the bear that the Rangers are unlikely to want to hurt it, thus keeping it from running off at the first arrow that lands at its feet? Heck, can we even communicate to it that we want it to cause havoc for a while, instead of just lumbering through, gobbling up the fish (or whatever we put at the end of the trail to get its attention), and leaving? Without being able to communicate directly with the bear (at least as much as you
can communicate directly with a bear in this universe; I'm not sure how articulate we could be and I doubt we'll ever find out, animal communication being Life magic and all), it's simply too unpredictable to be worth the amount of time it'd take to do it- which would be at least two hours to go there and back, and that's not including the time (and risk, probably to Omo since we don't exactly have Move Silently +20 as one of our skills) needed to set up the trail first.
I honestly liked the bearstraction idea when I thought we had a chance with communicating meaningfully with it. Without that, it's too risky to chance.