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If you could make all the quest/mission BCNM like the one's in the mini expansion (ACP, MKP, ASA), the people who come to help can enter freely the BCNM even if they don't have the prerequisites, but can't have the reward.
It would be easier to find people to do some BCNM. (Odin/Alexander for example).
This is a great idea for people who just want to help and don't want any rewards/clear data. You could argue it would spoil storyline and battle strategy details for people not up to that fight yet, but it would be very helpful for the people that have been stuck on a mission for months, even years.
I've been having trouble getting an Odin run done because of the annoyance of the pre-requisite quest. If the rules you suggested were in effect, I would have obtained Odin about a month ago! XD