JW711

Hi all! I just picked up a Nova 12 gauge a while back. I have heard that there aren't as many aftermarket accessories available compared to a Mossberg 500 or Remington 870. I was wondering if it might be possible to mount a side saddle? And also I really need to put a vertical grip on the pump. I have a condition in my left wrist that prevents me from turning my hand over, which makes it kind of hard to hold long guns in the normal way and to operate the action. I can do so by making a U with my left hand (with the thumb on the right side of the forend and fingers on the left) but this is unconventional. A vertical grip would be perfect for me. Are there any aftermarket forends with picatinny rails that can accept vertical grips? And if not then would it be possible to screw and tap one into the forend itself? Thanks for your help.