Id just like to point out i have conformation from either Linkshell members, myself or friends that every single job can enter and win the BCNM with a proper set up.
Here are some rough examples
-MNK MNK MNK DD (WAR BLU DRG SAM DRK PUP) WHM (RDM or SCH) SMN. Jobs so far 11
This set up has been used over and over, with 3 MNKs a decent SMN any healer or for that matter sub healer (TY /whm, /rdm if you are 99) will suffice. PUP can replace MNKs as needed, and DD are limited to a single slot but more on that later.
-BST x6 (maybe 1-2 SMN) Jobs so far 12
In this yes the job is specific but thats what happens when you bring a solo job to a 6 man fight. (still waiting on those "less isolationist" updates for BST)
-PLD DD x3 (same list as above but now including NIN DNC THF) a good WHM and one of the following (COR BRD SMN) Jobs so far 18
This is likely the hardest of the set-ups but it is possible and does not take a elite paladin, bring a tail or 2 for 2hr so to help if needed.
-BLM RDM SCH RNG of any combination x6 Jobs so far 20/20
This one needs preparation since the players will need 3-4 tails but, assuming you get those its a mage free for all, bring your best nuke/dmg gear and go to town.
A few final notes, while these are not exact set-ups they are the basic pieces, jobs can change and no premade set-up can account for players ability. If Mr. WHM only wants to cast Cure IV maybe you should get the RDM with fastcast. The last thing I want to point out is the enfeeble item was made specifically to make this BCNM easier. Any player choosing to ignore it accepts it will be harder, this is no different then attempting Promy fights without items (post nerf pre uncap). If you are going to complain do it after you have lost with 6/6 tails. Otherwise level sync to 30 and do a dry Promy fight come back with the results.