I know nothing about flavored cigars. I tried one my brother gave me once and didn't enjoy it - It reminded me of incense. So, from my very limited experience I will venture that flavored cigars are heavily infused with whatever is used to flavor them and that this infusion will affect other cigars if placed together in a humidor, whether the others are flavored or not.

If it were me, I would store the flavoreds in tupperware, separating various flavors with freezer ziplock baggies. Beads are good.

On the Spanish cedar - if it's freshly milled, you might smell it; it does have a slight, imo, pleasant scent. Fresh or not it won't impart much, if any, of it's scent to any cigar. It's primary property in regard to its use in humidors is water retention that is most suitable for creating an artificial environment in which to store cigars.