I'VE DONE IT & THINK IT CAN BE DONE, TO LENGTHEN THE SIGHT WINDOW SOME, PROVIDED YOUR CRAFTSMANSHIP AND CHOICE OF REINFORCING MATERIALS ON THE BACK AND BELLY ARE SUFFICIENT TO THE TASK. IT HAS THE RISK OF A FRACTURE HOWEVER, BUT THAT'S TRUE OF ANY BOW.
PROVEN DESIGNS BY REPUTABLE BOWYERS ARE BEST NOT TO MONKEY WITH. IF I WERE YOU I'D START GETTING COMFORTABLE WITH CANTING THE BOW WHILE SHOOTING.
IF THE BOW IS BLOCKING YOUR VISION PERHAPS YOU ARE SHOOTING OFF YOUR WEAK EYE, CHECK THAT ONE FIRST.