Vish,
I have been working with Safe software and have a "beta" of the electric migration tools workbench. As always, FME is a starting point just like the AssetPackage itself. Having worked with FME for over 14 years, it will require someone with a very good working knowledge of the source and destination DM and FME, this is not going to be an OOTB solution but a starting point. I have already built several workbenches to do this, Geometric Network to UN for both Gas and Electric, and each one turns out to be specific. You can, and I have, created custom transformer that are generic, but as we all know, everyone does things "just a little bit differently". But the tools will make this process easier than a lot of custom code.
Rich