  We explore an alternative explanation for the low-mass ultra-compact star in
the supernova remnant HESS~J1731-347 using a model-agnostic approach to
construct hybrid equations of state. The hadronic part of the hybrid equation
of state is constructed using a generalized piecewise polytropic scheme, while
the quark phase is described by the generic constant speed of sound model. We
assume an abrupt first-order hadron-quark phase transition with a slow
conversion speed between phases. Our equations of state align with modern
Chiral Effective Field Theory calculations near nuclear saturation density and
are consistent with perturbative Quantum Chromodynamics calculations at high
densities. Using this theoretical framework, we derive a wide range of hybrid
equations of state capable of explaining the light compact object in
HESS~J1731-347 in a model-independent manner, without fine-tuning. These
equations of state are also consistent with modern astronomical constraints
from high-mass pulsar timing, NICER observations, and multimessenger astronomy
involving gravitational waves. Our results support the hypothesis that the
compact object in HESS~J1731-347 could plausibly be a slow stable hybrid star.
