As far as I know there are no NuBus wifi solutions.  Also no NuBus USB solutions.   That pretty well eliminates both likely avenues for putting wifi in a 7100.   Any solution will have to start with the 7100s built-in ethernet (at which point, just run that 10ft. cable) or the SCSI port.   But I've never heard of a SCSI to wifi solution either, just SCSI to ethernet, and the 7100 already has ethernet.