I'm not convinced AWACS can be made stealthy.
The platform can be made VLO, no real fundamental problem there, the fundamental problem is that an AWACS needs to actively emit signals in order to do its job, powerful ones at that. Even with LPI, such emissions are almost certain to be detected and traced, even before we start talking about next gen digital RWR and EW gear that makes even fighter LPI radar modes detectable.
Rather than try to make AWACS stealthy, my crazy idea would be to aim to make the thing near impossible to shoot down. Bring back turrets and the Flying Fortress philosophy of WWII I'd say.
Stick a phalanx/goalkeeper/Type 730 on the bottom of the AWACS and laugh as you blast all incoming AAMs out of the sky before they can hit.
If the gun platform and structural reinforcements needed are too heavy, substitute for a bigass RAM/FL3000 launder instead.