I haven't messed with that particular boat but most small boats have a bolt-on arch. Look closely and you'll likely be able to see where it seperates from the hull. I'm sure it wasn't molded as one piece!
It shouldn't be too hard to remove - cut some caulking, pull off some access pannels, have a couple buddies hold it up, and unbolt the thing. You may have to make some sort of block off plates or something to cover the mess where it was, but that wouldn't be too hard to do.
If you were local to me here in NorCal I could likely walk you though it in an hour.
If you're not running radar there's no need for the arch. Most small boats like this only have one for styling. You'll likely have your anchor light on it, and maybe some speakes or overhead lights and it probably supports your canvas, but those are all easy to deal with if you want to go without.
Honestly I don't think it's a great idea. But at least if you're careful it will be reversable later.
Don
'01 22 Classic, 502/B1
And a bunch of other stuff
"If everything seems under control, you're just not going fast enough" - Mario Andretti