Actually, as long as you don't "apply" the armature in the modifier tab within blender, you can transfer it from blender into poser as an .FBX and it can be then posed like any regular poser-specific model. the issue is the grouping-tool in poser. it adds those numbers to any bone and group, nullifying any possibility to use the symmetry option for the posing. furthermore, it seems not possible to rename existing groups... (is there any way to rename existing groups??)

i'm rendering still images, meaning i don't use frames, so i didn't encounter the problem you described.