Maybe all we need is a Clockworkmod recovery or TWRP recovery?
I found out that the bootloader is unlocked, that means it's ripe for the pickings: http://forum.xda-developers.com/show....php?t=2551863
EDIT: I gave some more thoughts into this rooting method and realized that using Motochopper wouldn't work because it will attempt to install an ARM su binary. The Dell Venue 7 & 8 are Intel x86 tablets, we must find another rooting method. This is just purely a hypothesis as I haven't done any detailed analysis of the Motochopper exploit, but maybe we can substitute the ARM su binary with an x86 one from the Galaxy Tab 3 10.1 or ASUS MemoPad FHD 10.1 forums.
I know that both of these tablets have successfully gained root, the Galaxy Tab 3 10.1 requires the tablet to flash a modified system image with su already pushed into it through ODIN and the ASUS MemoPad FHD 10.1 requires the same process through fastboot. I know fastboot is already unlocked on the Dell Venue 7/8, all there is now is to find a way to include the x86 su binary into the Dell Venue 7/8 system image and we can just flash it into our system.
This will likely mean that we need to find a way to extract the system image from these tablets and then manually install the x86 su library to /system/xbin/su and then also bundle SuperSU.apk on the system as well.