Efficient High Poly UV Unwrapping?

Slugs

I'm doing Mesh and Texture cleanup work for 3d scanned people and working primarily in zbrush.

The original polycount for the object provided to me is roughly sitting at 650k polygons, my final cleanup sits at 1.5million after dynamesh (The fingers and other elements are relatively close together so I don't want geometry created between them after dynamesh).

I need the object unwrapped so I can project the existing textures onto the model post cleanup and fill the gaps with polypaint and export both the obj and diffuse jpeg for print.

I know traditionally speaking you're supposed to create a low poly object first, unwrap subdivide and conform to the form you want for successful results. But having a low poly mesh through re-topology isn't really a time effective option.

What would you guys and gals suggest be the best solution to my issue?

Edit: UV master can't handle that big of a polygon payload, and the unwrap doesn't have to be clean.

CharacterCarl

Here is a thing I did:

1. As retopo by hand is not an option for you, use ZRemesher:



2. Quick and dirty UV unwrap with UV Master. I suggest you take the time and do proper seams though, unlike me. ;P



3. Lastly, I used Maya to transfer the UVs from the Zremeshed model onto the high poly:



I don't have any experience with printing, so let me know if that works.

Slugs

This was great, worked really well! Thanks for the screencap tutorial