"If you know of any workarounds that would simplify things, please let me know."

1. Zero figure and export via PML.

2. Move arms down and export via PML.

3. Zero Figure again. Load "arms straight" as base and "arms up" as morph

4. Arms down is now a FBM

5. Export object with arms morphed down and remap.

6. Import to Poser and turn into figure. (No need to care about rigging)

7. Load "arms down" as base and "arms straight" as morph.

8. Export figure as object with arms set straight via the new morph.

9. Once again import and turn into a figure.

DO NOT let Poser "transfer" the morphs as it will only do a rough "projection". You have to re-load them via morph manager or edit the original cr2 to point to the newly UV-mapped object.

 

Just tested and it worked.