How to extend address header by two bytes?

[vetal26]

Hello, is there are a quick way to extend addressHeader by two header bytes?
As I see there already is similar feature included in latest releases of bitcoin core source code.

What I need is a direction for a way how to do it. Maybe bitcoinj community have suggestions where to look/what to change. It seems to me that bitcoinj requires a lot of source code modification for the way I want. Starting from VersionedChecksummedBytes class, Address class, ECKey class and more.