"His dark materials" were my favourite fantasy books... And I always wanted an alethiometer... Finally I made myself a golden compass, out of a skeleton watch. I swapped the usual digits for a printed version of the alethiometer symbols. The 3 watch hands can be scrolled to different symols, and then just let them tick... and see where they stop.
Since the whole golden compass thing is copyrighted to the bone, I can't sell these. But I would encourage you to try and create your own alethiometer!