  It was previously noted that SU(5) unification can be achieved via the simple
addition of light scalar leptoquarks from two split $\bf10$ multiplets. We
explore the parameter space of this model in detail and find that unification
requires at least one leptoquark to have mass below $\approx16\,$TeV. We point
out that introducing splitting of the $\bf24$ allows the unification scale to
be raised beyond $10^{16}$ GeV, while a U(1)$_{PQ}$ symmetry can be imposed to
forbid dangerous proton decay mediated by the light leptoquarks. The latest
bounds from LHC searches are combined and we find that a leptoquark as light as
400 GeV is still permitted. Finally, we discuss the interesting possibility
that the leptoquarks required for unification could also be responsible for the
$2.6\sigma$ deviation observed in the ratio $R_K$ at LHCb.
