  We study the properties of edge plasmons in two-component electron liquids in
the presence of pseudomagnetic fields, which have opposite signs for the two
different electronic populations and therefore preserve the time-reversal
symmetry. The physical realizations of such systems are many. We discuss the
cases of strained graphene and of electrons in proximity to a Skyrmion lattice,
solving the problem with the Wiener-Hopf technique. We show (i) that two
charged counter-propagating acoustic edge modes exist at the boundary and (ii)
that, in the limit of large pseudomagnetic fields, each of them involves
oscillations of only one of the two electronic components. We suggest that the
edge pseudo-magnetoplasmons of graphene can be used to selectively address the
electrons of one specific valley, a feature relevant for the emerging field of
valleytronics. Conversely, the spin-polarized plasmons at the boundary of
Skyrmion lattices can be exploited for spintronics applications. Our solution
highlights new features missing in previous (similar) results obtained with
uncontrolled approximations, namely a logarithmic divergence of the plasmon
velocity, and the absence of gapped edge modes inside the bulk-plasmon gap.
