Well, there is a little shorter way, IF you want to take the realtracks back into logic.

Do a mixdown in Logic, open that wav file in RB
You'd still be wise to bring the midi in too for chord recognition.
Generate your Realtracks and realdrums, then export those realtracks as wav files to be imported back into the original logic file.

It *may* save time bringing all the audio tracks into RB already mixed down if the end goal is just to generate realtracks for use back in Logic...

Depends on where the project is going to end up.

I do not work here, but the benefits are still awesome
Make your sound your own!