You can do that via patching:
CODE
;
W810 SW-R4EA031
; ‘¬Ą čŕ¨äâ ˘ Ż«ĄĄŕĄ ¨ ˘ ¤ŕăŁ¨ĺ ¬Ąáâ ĺ (c 20B 16B)
; Change main font from E_20B to E_16B
; Affects Operator name and "Now Playing" in Walkman
; You should use the custom layout.xml bundled with this patch
; Otherwise some texts in screen will be misplaced
; (c) cheapo
;(p) AlexAiS aka Tim
;
44575D38: 320030 310036
44575D48: 49 42
Copy text above, paste in notepad and save as all files with .vkp extension
If you don't know how to patch, search
HERE