Can you provide some ball-park estimate of time and cost of our migration project?

Yes we can, but we need some information from you first! Since we provide services and not licences we have to ascertain the size and complexity of your application and a couple of other circumstances (e.g. your concept of the target scenario; integration points, like interfaces; planned task split; etc.) in order to develop any estimate.
We are happy to run a quick analysis on your source code with our KnowledgeLiberator tool to measure complexity, please apply for a free code analysis if you are interested!