I just got this working and I thought I'd share how:
I tried this on a whim and it worked like a champ. Let me know if I've forgotten anything, and also if this works with Apex. I'm sure others will be curious. Also, both Nova and the default launchers have an icon in the app drawer, so its very easy to switch back an forth.
- Back up everything and root your device. See instructions elsewhere.
- Install a root capable file manager. I used Root Explorer.
- Get a copy of Nova Launcher. I used the one from my AOKP prebuilts folder. You could get it from the market and copy it out of /data/app/
- Using your file manager, mount /system r/w and put the launcher in /system/app/. I put my Superuser.apk there too while i was at it.
- Change permissions to rw-r--r--
- Profit!
I tried this on a whim and it worked like a champ. Let me know if I've forgotten anything, and also if this works with Apex. I'm sure others will be curious. Also, both Nova and the default launchers have an icon in the app drawer, so its very easy to switch back an forth.