... i was thinking on wood poles and run some string around them. all suggestions are welcome
Good idea! That will save you transporting bamboo stakes. Yet you'll have to figure out how to thrust them poles into the ground. I use a pointed crowbar...another option would be tying the side branches to the main stem, which is not applicable in your case since you don't have one due to so much topping...
As for the height, 10 ft is what you're gonna end up with, if not more, meaning ~10 lb fresh matter each...
Orpheus