BOAC, if the LH narrative (p. 88 of the interim report) is taken at face value, AF447 was already in the clouds at FL350 on reaching ORARO. So on that basis, I would posit they were already in what they were in, and did not point themselves in the direction of a Cb.
And beyond that, I think we both agree that we won't know more until the full CVR comes out (though even a negative on the full CVR could be telling).
I do find it curious that the BEA dropped the LH and IB flights from the interactive, yet included flights on UN866, 90 NM to the west. Perhaps these two UN873 flights, with more detail, will re-appear in the final BEA report.