A purely personal point of view...Whilst there is a certain art to mountain flying, it can be learnt; however, like any skill it takes time and experience to become competent. Like any job, the difficulty comes when there are others who are more experienced and better qualified for the job.
Now the job may sound/be more than interesting than N Sea, but surely the pay will be worse...? Anyway, if you stick around with CHC and you might be able to move to SAR, should they be successful in winning SAR(H), in a few years!