Hello Earl:
I am afraid that is not possible, in a project you can either have processor expert KSDK components (fsl_xxx) or legacy components (LDD).
So if you want to migrate to KSDK, then you have to start from scratch, creating a KSDK + PEx project, adding KSDK components and configuring them in a similar way to your old components, but keep in mind that KSDK drivers (APIs) are very different than old PEx drivers, so this will require some time+work.
I hope this helps.
Regards!
Jorge Gonzalez