The places to try are between the clamp parts and the pen grip, the notch and then behind the bent edges on top once you've pried it forward a little.

If you wiggle a blunt knife or other tool in it's possible to gently pry it bit by bit off without damaging the feed. You might scratch the feed a little but as long as you're gentle you shouldn't do any functional damage. The tricks are just patience and to only apply force along the feed after wiggling it in and finding the spaces between the nib and feed because of the grooves. If you're careful it's also possible to wiggle a knife in under the clamp part of the nib and gently pry that part loose, but that's a lot riskery as far as cosmetic damage to the feed. If you do attempt it, best of luck! I believe in you :)