As of 3086, we're already seeing an increase in production on worlds well within Canopian space, with the Penthesilea being a big example. What would the difference be if Detroit had the House Liao emblem flying over it? The alliance with the Confederation most definitely isn't off by or 3130 or anything, so it's not like access to the machines that roll off Detroit's lines would be restricted more than they were during the Trinity Alliance years.
Maybe the consequences of the Victoria War meant that the Magistracy couldn't support Detroit with a decent supply and/or logistics train, or maybe Detroit was simply found to not be as defensible by Canopian troops needed on the FWL-s or Rim/Marian or Taurian or FedSuns or Republic border?
My point is that any hand-off, if canon, wouldn't really affect much, since at this point we're really looking at the new Federated Commonwealth anyways, with regards to armed forces deployment.