|Re: A recommendation (database migration)
EMS Sql Manager has a great list of tools for Firebird and Interbase that will provide the very processes you are looking for... https://www.sqlmanager.net
Granted these are commercial products but I have been using them for years and have found them to be quite reliable with decent technical support as well.
However, if you are interested in developing such a tool, maybe we could collaborate. I work with the Microsoft development products and primarily develop for the desktop in VB.NET but I am fluent in C#. I haven't done any web development in years and prefer to stay away from it given the complete mess such development has become...
Sr. Software Engineer