Many Pose files (*.pz2) are using readSCript to load a collection of morphs/partial poses, etc...
Exemple:

So that I suppose that it should be possible to create a pose file or a props file that loads two files dropped in a dedicated place of a runtime's structure.
But I don't know if there's a tool to create this, I think that it should be easy to create it using a Python script.

𝒫𝒽𝓎𝓁

---

(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sequoia 15.2, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️