In theory, yes.
In practice, very demanding. You are suggesting a Starlink kind of radar constellation. Starlink's very low earth orbit satellites orbit at 340km which is about the AWAC's working range (horizon at 10km altitude). However AWAC's radar antenna is huge. Even though RCS return of top view of the aircraft is also large, but the satellite's antenna is tinny in comparison. Besides a Starlink kind of system at this altitude need over 7500 satellites to provide always over head coverage to monitor a quick moving target. Remember for Starlink to work the satellite does not need 90 degrees over head because it uses AESA to track and aim at the receiver. This works once they are in sync. However, an enemy aircraft is non cooperative, the satellite must be over 90 degrees on top to be able to find the aircraft, that is a lucky shot. Tracking afterwards is easier, but finding is difficult.