i put together a material using lerps. Its like an art peice made of string 
All those functions on the left enumerate from 1 to 32, and they each creat an alpha whish masks a single segment/square of the UV grid.
this is the material function
All 32 texture maps, in one material.
Dont worry, I wont make you copy it out. The UE4 material assets are atatched. Place them directly in your content folder.
The way I have set it up, the textures maps enumerate in rows from left to right, and top to bottom. The same way a page of english writing does.