Going back to flying basics if we found ourselves in a runaway trim or unusual attitude putting your airliner in a high nose up pitch attitude rolling into a 60 degree bank to drop the nose back down to the horizon was part of the recovery if necessary. I know the Airbus 320 has a restricted bank angle so the pilot cannot not exceed that bank.
In Direct Law those restrictions do not apply and you can roll the A320 into a spiral dive straight into the ground should you so desire. Even in Normal Law you can get a bank angle of up to 67 degrees, so the maneouvre you describe above is perfectly do-able in the A320.