Yep, you can do anything you want with the mip levels, if you can import/export into/out of Photoshop. I've rendered geometry into slices before, using 3ds Max, to make 3d volume textures. I used animated modifiers to Slice and fill the innards. ProBoolean also might be an option, depending on your models.
It means hand-crafting the mips, or controlling the way the mips are created. Nvidia's photoshop plugin for making DDS files has some controls for biasing. It's a bit of trial-and-error to do though, and assumes you'll be using DDS container format.. Though you can extract the mips as individual bitmaps if you want, to…