The only thing that I can think of, if this function does not work or will not work by launch, is to load the model or lower detail version of it with invisible textures and try to keep it in sync with the first person model.
I don't know if the shadows will still be visible.
This will undoubtedly be the less efficient way of doing this just for some shadows.
Main Rig:
10850k at 5.2GHz
64gb DDR4 at 3600MHz 16-19-38
RTX 2080TI FE +200, +550
2tb m.2 intel 680
2tb ssd evo 970
Secondary Rig:
9700k at 5GHz
32gb DDR4 at 3200MHz 16-18-38
GTX 1660 Super Gigabyte Tri Fan SSC +100, +450
256gb SSD
1tb HHD
Main Laptop:
7300HQ at 2.5GHz
8gb DDR4 at 2133MHz
1050 TI
256gb SSD
Secondary Laptop:
2019 MacBook Pro 13inch