  We investigate collider signatures of standard model extensions featuring
vector-like leptons and a flavorful scalar sector. Such a framework arises
naturally within asymptotically safe model building, which tames the UV
behavior of the standard model towards the Planck scale and beyond. We focus on
values of Yukawa couplings and masses which allow to explain the present data
on the muon and electron anomalous magnetic moments. Using a CMS search based
on $77.4 \, \rm{fb}^{-1}$ at the $\sqrt{s}=13$ TeV LHC we find that flavorful
vector-like leptons are excluded for masses below around $300$ GeV if they are
singlets under $SU(2)_L$, and around $800$ GeV if they are doublets. Exploiting
the flavor-violating-like decays of the scalars, we design novel null test
observables based on opposite sign opposite flavor invariant masses. These
multi-lepton distributions allow to signal new physics and to extract mass
hierarchies in reach of near-future searches at the LHC and the HL-LHC.
