This should work. Copy and paste the code below into notepad. Replace ORIGINALFONT and NEWFONT with the appropriate file names. Save it as something like fontswap.bat in the galciv2 font folder. Open the folder and double click fontswap.bat and you're set. Use at your risk, I'm not responsible if it breaks your game, yadda yadda yadda.
When you want to return to the original font, you'll have to go to the folder in DOS and type: fontswap restore
Sadly, MS removed a nice little program called choice.com in modern versions of windows, otherwise this could've been more interactive. C'est la vie!
------- Copy and Paste Below -------
@ECHO OFF
IF %1 ==RESTORE GOTO RESTORE
REN ORIGINALFONT.TTF ORIGINALFONT.BAK
REN NEWFONT.TTF ORIGINALFONT.TTF
GOTO END
:RESTORE
REN ORIGINALFONT.TTF NEWFONT.TTF
REN ORIGINALFONT.BAK ORIGINALFONT.TTF
GOTO END
:END
ECHO Done!