The iLCSoft software stack, developed originally by the linear collider communities, is part of the Key4hep software stack. While iLCSoft comes with its own event processing framework in the form of Marlin, Key4hep has decided to adopt Gaudi as its main event processing framework. In order to make it possible to benefit from the almost two decades of development work that has already gone into functionality provided by iLCSoft, a Marlin wrapper has been developed that allows Marlin Processors to run inside the Gaudi based Key4hep framework unchanged. This milestone demonstrates the ability to run existing reconstruction and analysis chains from iLCSoft entirely inside the Gaudi ecosystem.