Even though this is not the same use case, some parenting with physics has been discussed here as well: Havok and LOD terrain - #10 by CrashMaster
Maybe you can take something from this PG for your own use case:
Even though this is not the same use case, some parenting with physics has been discussed here as well: Havok and LOD terrain - #10 by CrashMaster
Maybe you can take something from this PG for your own use case: