Best and fastest way to load Parameters tables, Workers, Assigning employees and all setup data at Go live Date

Hi , 


One of my client is having an issue about choosing best way to load Setup tables, Parameter tables, Workers, Employers, Assigning users and etc during go live. We have lot of data for these to be loaded. We are unable to use DIXF for loading Employers, users , assigning workers etc because DIXF doesnt support inheritance tables(Ex: DirParty, DirPerson etc...). The only option we have left is by manually entering, but it might take few days which is not a considerable option for go live. Can some one please suggest what would be the best approaches for loading these above mentioned data. etc.

We are using Dynamics AX 2012 R2.

Thanks in advance.