Add font to LiveXP, how & modifying BootSDI.wim.

How would I add Source Code Pro font (http://reboot.pro/17557/) to LiveXP. Long back I had copied segoeui.ttf to the fonts folder and added

// Add Segoe UI
Hive_Load,Software
reg_add,0x1,"%reg%\Microsoft\Windows NT\CurrentVersion\Fonts","Segoe UI (TrueType)","segoeui.ttf"
Hive_Unload,Software

but it did not work.

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What's the easiest way to add/delete/replace a file in BootSDI.wim ? For eg., if I just want to replace bootice,exe with  a newer version.