I do not think that it will be as desired and easy as you think.
First, DL (or DLNW) is a different company and might have commercial attitudes that dont align with AFKL. They do compete with other US carriers (and non-US) ones and might think that they need to offer a better FFP than FB.
Second, it would not be easy to implement unless they introduce totally different fare buckets for their JV with AFKL. For example, DL will sell "M" fares to CDG, FRA, MEX, Asia. They implement the same accrual ratio for all of them. yes, they could multiply the fare buckets depending on whether it is an AFKL codeshare, an AFKL JV noncodeshare, a non JV, etc.. , but that would quickly become unmanageable.