Double rope simul-climbing is doable. I like having one person tie into the middle of one of the ropes, the other climber ties into the two ends. The second rope is coiled and carried on the back on either climber. All advantages of double rope systems are in play: low impact forces on gear in case of a fall; low rope drag; etc. with only ~30-35 meters between climbers, communication is pretty easy. If you don’t need second rope for descent, leave that shiz at home.
I don’t advise using this system unless both climbers are very competent on the terrain.
Prussik and....Link the two climbers together with a long sling. Then if there is an inequality of weight distribution, the rope can not slide much....however, I would avoid anything like this unless it were absolutely mandatory, as in the bears had already ripped of an arm.