Other that the sling type tree stands,I would have also said the Windwalker.They list it at 7.75 lbs but my newest,used one is 6 lb 11 oz and an older one is 6 lb 5 oz.Don't forget to factor in tree steps.Also keep in mind that the sling type stands put you mostly behind the tree and the trunk has to be clear of most branches from the hang strap to your feet,so you can shoot and maneuver.I imagine the trees there are thick,with limbs to the ground.
The biggest black bear I ever mounted-or have seen for that matter,came off Kuiu island and was,maybe is,the Alaska state record and #4 in B+C.The guy had video of one maybe as big.
Sounds like a very special hunt.Good luck.