Thanks. I figured it the exact coding to be simple and minimal.
Go to UserControls > Skin > LoginStatus.ascx > LoginStatus.ascx.vb
Between the If line and the Else lines add the following two lines of VB:
Dim arrNameAndVAT As Array = Split(UsersBLL.GetNameandEUVAT(DirectCast(Page, PageBaseClass).CurrentLoggedUser.ID), "|||")
KartrisLoginName.FormatString = arrNameAndVAT(0)