Custom build pipeline that reimports all textures?

Hello everyone. I have a question about custom build pipeline. In our game, we made all the textures at very high quality. If we select a non compressed format ("RGBA 32 bit" for example), everything looks great on big resolution devices. But for small resolution devices, we want to be able to use a compressed format ("DXT5" for example), so we can keep the file size to a minimum. Is there any way to create a custom build pipeline that will build the game twice? one time with compressed textures and one time without? Thanks!