Tinbasher.
I think you might be rather mistaken.
The the changes to B-HLE will be limited to minor changes to the LOPA, using the CX seats but changing dress covers and things like seat arm caps.
As for swapping interiors between the B-HLx and B-HWx, utter poppycock. The interior on the whiskies is own by the lessor, so don't you think that they might have something to say about that?
Consider IFE fit and the fact that the later aircraft have the enhanced cabin.
You are right about the brake cooling fans. The retrofit cost is prohibitive and they weigh rather a lot, so the limas will use ground cooling as required, just as it the case with the existing CX operation.