First, placing 2 complications in a single case is more difficult than to have them separetely in two different watches. The more you add complications in a single watch, the more difficult it is to make them work together.
So a QP+Chrono is more difficult to craft than a QP alone or a chrono alone.
However, I think that you have already an anwser to your interrogation: you seem to prefer getting a QP and a chrono separetely already and that you are not that fond of the Chrono+QP references right now.
You like the 240, you like thin watches, you maybe like switching: you definitely prefer these watches because of what they offer in terms of aesthetics and movement, more than the 5270's.
This is a perfect way to go and getting a 5270 is not an obligation at all 
For instance, as far as I'm concerned, I love the whole iconic combination and the place it had in Patek's history: this is subjective and just my own way.
Thanks for bringing this view on the matter.
Cheers, Mark