There are no automated translation tools from BSP to WDA. Although similar in structure (both MVC and Unified Renderer based), the technology implementation is very different. BSP uses MVC - and has Model and Controller objects. However these ABAP classes are in no way compatible with what Web Dynpro generates. WDA also has the concept of Context which doesn't exist at all in base BSP (although CRMUI does have a context, this is just a wrapper around the BSP model class and isn't compatible with the WDA context either).
The view becomes even more problematic. Although the HTMLB, XHTMLB, and PHTMLB tag libraries are similar to the standard UI elements in Web Dynpro, the WDA versions are much more advanced. You probably could map most of the properties and tags to WDA, but not everything. However the fact that in BSP you can inject any custom HTML and JavaScript becomes an issue because there is no way to do the same in WDA.
Overall, you should just start from scratch and redesign the application as WDA.
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