Not really possible. You would have no vent in your right fuel tank, if you completely separate these two.
The only option would be: to remove the plastic plug in the filler neck and run it just with the aluminum gas cap, as that’s vented, or leave the barb fitting at the top of the filler neck open. you would loose the charcoal canister and you would smell gas in your garage.
You would also have to remove the rear wheel, undo shocks, bevel box NVH bracket, drop the swingarm, undo the tensioner straps for gas tanks, undo filler neck clamps, gas tank bolts and then try to remove the crossover hoses/pipe. At that point, it will be easier to remove the tank and re-weld it.
