Its really easy, you might be able to flash them with your expert, in fact it should work fine as they're the same chipset.
Best way to do it is take out your expert bios, but some thread underneath it when you insert it back into the bios socket. Then boot up, use a Windows boot disk with the SLI-DR bios on it and the AWDFlash program (I think thats the right one, but could be wrong), then pull the string to whip out the Expert bios, pop in the SLI-DR bios, and force flash it with the -f command.
Viola

SLI-DR bios flashed and ready to be used.