Just in case some one else is searching for BLE on Nexus 7 - this ROM has a working BLE on 4.4 KitKat. It is almost Stock ROM called 'purity'.
For those of you having problems with 'cut' , just comment out the line using 'cut' in ubuntu.sh or ubuntuv6.sh (its the 3rd or 4th line). It is checking for root so if you have already done 'su' then it doesn't make any difference. For some reaso...