how do I register for a bitcointalk account without having to get a proxy ban
Register using a different connection/IP or you can try your luck with an unknown/less popular VPN providers (might work [50 - 50]).
On a side note:
25. Ban evasion (using or creating accounts while one of your accounts is banned) is not allowed.[e]
25. If you get banned (temporary or permanently) and create a new account to continue posting / sending PMs, it's considered ban evasion. The only exception is creating a thread in Meta about your ban.