If the world were a perfect place, we would sure have all modifications of all aircrafts. And I too would buy a Bison, Lancer or whatever they made. But sadly we have to consider priorities in distribution of resourses and manhours.
Seeing the slow progress in finishing the Bis' systems, I don't think they have a lot of those resourses to spare. Especially while having to split them between F-14 and whatever A/Cs are currently in developement. The visual part of Bison/Lancer would be no problem for LN, but modelling the systems would be a long and painful process considering their complexity compared to the bis.