A number of things to respond to here. Sorry about the delay, but I thought I was supposed to get email notification when someone commented on this thread, but I haven't gotten one since the second reply, anyway...

Of course I could take it to a bike shop. I'm not impoverished, I just like tinkering. I'm posting here, because I want to figure out how to fix it, and to learn more about bikes in the process, even pos bike shaped objects.

I really don't need the tool to remove the cassette. The cassette is already removed, because it's broke. I was mentioning the removal tool, because I was wondering if it was possible for a Shimano cassette that gets tightened with the FR 5 could possibly be compatible with a cassette that cannot be tightened with the FR 5, but I think it's pretty obvious at this point that they are not compatible.

I've never removed a freehub body before, so I'll probably try to do that, and replace it with a proper one, or like someone else said, just by a whole new rear wheel. Thank you for all your responses.