  Chirality, a characteristic handedness that distinguishes 'left' from
'right', cuts widely across all of nature$^1$, from the structure of DNA$^2$ to
opposite chirality of particles and antiparticles$^3$. In condensed matter
chiral fermions have been identified in Weyl semimetals$^4$ through their
unconventional electrodynamics arising from 'axial' charge imbalance between
chiral Weyl nodes of topologically nontrivial electronic bands. Up to now it
has been challenging or impossible to create transport channels of Weyl
fermions in a single material that could be easily configured for advancing
chiral logic or spintronics$^{5,6}$. Here we generate chirality-directed
conduction channels in inversion-symmetric Weyl ferromagnet (FM) $MnSb_2Te_4$,
emergent from a deep connection between chirality in reciprocal and real space.
We alter the bandstructure on-demand with an intake and a subsequent release of
ionic hydrogen ($H^+$) $-$ a process we show to induce the tilt and rotation of
Weyl bands. The transformed Weyl FM states feature a doubled Curie temperature
$\geq50K$ and an enhanced angular transport chirality synchronous with a rare
field-antisymmetric longitudinal resistance $-$ a low-field tunable 'chiral
switch' that roots in the interplay of Berry curvature$^7$, chiral anomaly$^8$
and hydrogen-engendered mutation of Weyl nodes.
