There is a new game in the line "Hunt for the Ring" which covers the journey from Shire to Rivendell. There are official rules published there regarding linking of "Hunt for the Ring" with "War of the Ring"!
But there are no rules for linking "Battle of the Five Armies" to "Hunt for the Ring" or "War of the Ring".
With "Hunt for the Ring" happening in-between BOTFA and WOTR there appears a sudden opportunity to create a 3-piece legacy experience from BOTFA through HFTR to WOTR. The only missing link is BOTFA->HFTR.
I think there should be such. There is already a mechanism in "Hunt for the Ring" which adjusts balance between Hobbits and Nazguls.
What if we link this mechanism with the output of BOTFA? The options there are two-dimentional (amount of information traded to Nazgul and amount of cards to choose information from) which is perfect for tunning.
I invite you for proposals of transforming BOTFA output to that mechanism.
Remember that the mechanism in HFTR has huge balance effects so adjustments should not be severe.
Of course there could be a secondary more thematic mechanism which translates BOTFA output on the Erebor presence of dwarves. Since the difference between 1st and 2nd edition there is the addition of the Dwarf elite, there could be some easy adjustable rule like "adding/removing of Dwarf regular from Erebor" on top of "HFTR" influence.
Well there is 60 years between Hobbit and Lord of the Rings so it makes more sense to me using HFTR as a prologue. But still interested in what other people have to say.