You can get whatsapp working by doing this. A little messing about, but it works fine. I have it working. I cribbed these from a link I found a while ago which relates to the N7 but works ok on the N10.
Links quoted in text are here:
http://www.whatsapp.com/android/
http://www.backes-srt.de/produkte/srt-appguard/
http://www.bluestacks.com/
A. Whatsapp apk (must be the absolute latest version, since it can't be download via Google Play store, download the apk from WhatsApp for Android This can be download it right on your N7, any browser!)
B. Appguard apk: SRT AppGuard (don't worry about the German, the app is in English. This also can be DL using your N7, but you'll have to click and hold the "Download der appguard.apk" and Save link as.)
1. Install WhatsApp, once installed just close it.
2. Install AppGuard
- Start up open/run appguard.
- Select "Secure a new app"
- Select "Whatsapp"
- Appguard will take you through 3-steps:[*]scan and secure application[*]Uninstall existing application[*]Install secured application
Once the process is completed, within Appguard, you'll need to change Whatsapp Permissions by removing the setting for "Phone calls - read phone status and identity"
3. Download and install Bluestacks on your PC: BlueStacks App Player
4. Select "Messaging" and install WhatsApp on your PC.
5. Input your mobile number. You should get a text with the 3-digit verification code. Be patient, it can take few minutes.
6. Once you have your code, go back to your Nexus 7, run WhatsApp, press menu (3 dots on bottom right corner) then input the code.
For 6.......I had the same issue; the option to enter the code did not appear until I submitted my country and phone number also through Whatsapp on my Nexus 7. Naturally due to the missing mobile network on the device I got an error. So I tapped on the button call me which yielded yet another error. Click away from that message and if you now click the three dots icon in the bottom right corner the enter code option should be available. Good luck!