What is the best way to migrate a large FoxPro application to .NET in small increments using the Mere Mortals framework and COM interop?

My idea currently is to keep the interface entirely in FoxPro until all data access and business logic are migrated to .NET. This way I can use XML for the data transfer between the .NET business objects and the FoxPro UI, and using XMLTOCURSOR, none of the control bindings will have to change.

This approach will make heavy use of COM interop. Is this practical in terms of performance? How well does the Mere Mortals framework fit with an approach like this? Is there a better way?

Thanks in advance