Oh, about detaching the scythe, me and my sister just talked about a Pit cosplay(how to make his sword/bow detachable.), You could use some sort of... I want to say pvc pipe but I don't think it's work especially because of the way the scythe looks... Anyways. You could take a big pipe and a small pipe, so one could slide into the other and look like one big weapon, yet be in two pieces when need be, and attach a clip of some sort, so it wouldn't fall apart. I'm not sure exactly how you'd work this out but it's just an idea.
Uwwaaagh. I'm a weapon idea failure. xD
Oh, if you're in the gresham area, you could check out the SPIRIT store they have some good guns, sometimes.