If OEL was willing to waive and the Oilers were willing to make the trade, the Canucks would most definitely do OEL for Koskinen, Turris and a 1st. OEL is good now, but the Canucks obviously have issues they need to sort out now, while OEL is performing at a high level.
If Halak was willing to waive, he would make sense to throw in as a capable low cap hit (but likely to hit decent bonus impacting them next year) backup for the Oilers.
I just don't think the Oilers do that trade, or anything like it.