The end result of the above is a BT3 module that you can just drop into /BT3/optional (add load=901_net_gfx to syslinux.cfg) directory on a USB stick or SD card.

Thanks Vladsmail for the great tutorial on how to do this properly

I've tested this with a clean install of BT3 without persistent changes, with no problems. Obviously if you already have changes with drivers installed, you may run into some conflicts...