You should consider the two frameworks two VERY different frameworks. They are not designed to work together. If your AE toolbar was designed to work with an AE map control, there is no way to get it to work with the WPF Map control.
In general any AE you do, you will need to "convert" between the two frameworkks, like for instance geometry types etc. I know some people have taken advantage of the much larger AE framework to for instance do complex spatial operations, or create custom dynamic layers that uses AE for doing ExportMap operations against an MXD, etc.