Thank you kahnjar for your replies! I am currently testing this method on another warped dhal. It has a worse warp than this.
I applied steam on both sides on the sections that I intended to flex back into shape..
Next i wiped off the steam/residue and then applied pressure with weights ( around 50kgs) on top of the shield while the shield is laying flat. I have left the shield in this position and also heated up the room with a small heater and left it running over night to dry out any of the moisture..
Its been in this position for around 20 hours..
will post my findings soon. I may have to repeat this process 2-3x times for the flatter result i'm looking for.