i feel like roughly anything goes. fb-press/zone is pretty interesting, because its the highest and lowest fatigue fb set. when you are 12 deep, you could run it out, and if not, you could run the zone instead. or maybe even a hcp, although im not really a fan of hcp and kinda think its a waste as it has a meaningful impact on fatigue and only raises TOs for 20% of possessions. basically i'd run it if you feel the extra fatigue is nearly 0 cost.
i think fb/fcp is hands-down the most dominant set in the game for really, really, really good teams, and you can overcome a lot of talent with depth. but fb/fcp is SO intense on fatigue, that simply being 12 deep is not enough, even if its an even rotation (5 guards 5 bigs 2 sfs, or what have you). you really need stamina. stamina is a top line core for every player in every situation for fb/fcp, its up there with passing for pg, per for per scorers, ath or reb for bigs. you really basically only want upperclassmen in the 80s and preferably 90s, i think 85 is a good team average target for the whole team.
fb/man is a great scheme that is near and dear to my heart, and is an easier transition for folks are not really accustomed to fb, because man is the most straightforward of the defenses. fb is different than the 3 main offenses which are all way more similar to each other than fb is to any of them, so i think the man pairing helps reduce complexity. pairing with man is a quality scheme that can be run with 10 players, is very possibly the best man scheme for really good man teams, and is one that is not too hard to ease into.
i think most folks aren't that comfortable with fb or zone, so putting them together can be a bit rough, but if you are already comfortable with one or both, it should be fine. fb/zone is by a little bit the lowest fatigue fb scheme, and may seem backwards with zone being the lowest fatigue defense and fb being the highest, but you kind of can take things to an extreme you otherwise could not. you still want 10 players if you can get it, but because zone and fb are both star oriented schemes that allow you to really focus on things like reb/def in bigs and pass in pgs, etc - you can get REALLY good at all of those things. it also lets you recruit the most untraditional players. fb allows non traditional, high ath/spd low lp/per scorers to be a lot more effective, and zone allows you some slack on the ath/def pairing that seemingly half of the coaches prioritize above all else. strong 3 point scorers are a must, but otherwise, you really have a lot of flexibility, and studs can go super far.