Random user dropping in here. Based off this line here...
> The way it looks like you're trying to strong arm me to buying another account just to have it claimed in order for this to go through, you're mental if you think that will happen
it seems like you're misunderstanding something. They want you to claim your nephew's account which was involved in the case, not a fresh alt. Yes it isn't technically isn't your account, but you did play on it which means they have to investigate it to make sure that account doesn't have suspicious stats. Don't buy another fresh copy of the game, I'm not sure how BF4DB bans works but I think they might ban by I.P. as well so you'd just be wasting your money. (See link below for source) Either way, claiming a fresh account doesn't help your case. They need to investigate the accounts involved in the banning, and a fresh alt definitely has nothing to do with a case from a year ago.
You could try talking with your nephew to ask if you can claim his account so you can get your appeal started, but that'll likely end in his account getting banned as well since you're linking your banned main to it. Assuming that you really weren't hacking though, both accounts should be unbanned after they finish investigating. (See source below)
As you said, you don't really play anymore, so I'm not sure if it's really worth it to you. I also don't think accounts can be unclaimed once they are claimed, as I can't find the option to do so. Also being rude to the admins isn't going to help your case any lol.
https://bf4db.com/forum/thread/whats-a-linked-account-1245