XF 2 Switchable User Usergroup

[Maa]

Hi I am looking for a coder to develop a mod which allows paid members to switch user groups if they wish to.

example if they purchase:
premium account
gold account

they can switch it in the user acp settings

please quote price + timeframe

payment is ONLY in PayPal or bitcoin

do not waste my time by asking for bank transfer or western union or any other method