Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
Oxygen is an enemy of rubber? Thought it was Ozone.
Silicone legs? I'm not familiar with them but seems like a good choice.
I tie a black cricket?
Come to think of it I don't think I've had that flex floss rot, but it probably will/can.