A quick n' dirty (as usual) test in Blender at retopologizing and manually (pun intended) rigging a great scan: ["Hand"](https://skfb.ly/6GW88) by [Artec 3D](https://sketchfab.com/artec3d), available under CC-attribution.
The base mesh used for the retopology is [Low Poly Human Hands (All Quads)](https://skfb.ly/6NUy9) from [Jeremy E. Grayson](https://sketchfab.com/JeremyGrayson), also available under CC-Attribution.
Based on an original "concept" by Michelangelo, from the Sistine chapel's ceiling ;)
![Creation of adam picture](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Michelangelo_-_Creation_of_Adam_%28cropped%29.jpg/800px-Michelangelo_-_Creation_of_Adam_%28cropped%29.jpg)