Mass-split systems based on a conformal infrared fixed point provide a low-energy effective description of BSM systems with large scale separation. We report results of exploratory investigations with four light and eight heavy flavors using staggered fermions, and up to five different values for the light flavor mass, five different heavy flavor masses, and two values of the bare gauge coupling beta.

We discuss why a model with four light and six heavy flavors would be phenomenologically preferred and give an outlook of our ongoing and planned future investigations featuring domain wall fermions.