NOTE: I made this on a game that includes the altered sprites from the Miranda Class (In the thread called 'Help with Importing ships'), I am not sure if it works without those altered sprite files.

//*********************************************************************************************************
Open 'Gui_Global' (C:\Program Files\Activision\Star Trek Armada II Fleet Operations 3.0\Data\Sprites) and look for: 

kli_vorchaw5	wireframe03	96	192	96	96		#		

add beneath it:

kli_chancellorw5	wireframe03	96	192	96	96		#		

//*********************************************************************************************************
then find:

b_kli_vorcha	klingonbuttons01	173	88	80	80		#	3	2

and add beneath it:

b_kli_chancellor	klingonbuttons01	173	88	80	80		#	3	2
