How to apply 246 textures to terrain?

Hi guys, so i brought this pack for texturing my terrain ( 300+ Hand Painted Textures Mega Bundle in Textures - UE Marketplace ) .
Now i have the slight problem that i do not want to apply reflection diffuse and normal for each map and add it to my terrain texture, is there a way that i can take the 246 premade shaders to another shader and from thereon apply that to my terrain and will be able to paint all of the textures…?

Pleeeeas if anyone has an idea or something i will be verry happy since i have been struggling with this for a while!

Best Regards