Rigidbody Switching?

Is their a way to enable a “Flex Actor” in runtime witout any delays when it gets set active?
Iam using a normal Unity Rigidboy, and want to switch that one in runtime to a “Flex Actor”.

The problem is that the “Flex Actor” always starts with 0 velocity, which makes it “hang” when switching from a unity rigidbody which is falling cause the velocity does not get transfered.

How can i carry over the velocity of a Unity Rigidbody to a flex actor which just had been enabled?