Enabling Push Model replication in 4.27

It would seem that push model replication can only be enabled for editor builds.

When I add bWithPushModel = true to my target.cs, the build says:

ERROR: MyProject modifies the value of bWithPushModel. This is not allowed, as MyProject has build products in common with UE4Game.

Has anyone been able to use push model replication in 4.27 on a vanilla engine build?