  Superconducting transmon qubits with strong anharmonicity and insensitivity
to offset charge are highly desirable for low-error implementation. In this
work we propose a c-axis junction, comprising triplet superconductors, and set
at a relative twist angle. Invoking spin-orbit coupling and spin polarization,
which are known to occur in the material platform of choice, we examine the
resulting transmon Hamiltonian. This junction allows for direct control of the
single and double Cooper pair tunneling strength, and most remarkably, an
anomalous magnetic flux -- i.e. a phase offset equivalent to magnetic flux, yet
in zero magnetic field. Having control over these three parameters -- single
and double pair tunneling and anomalous flux -- allows for optimal design of
the transmon qubit. Interestingly, in this architecture, the anomalous flux is
determined by the twist angle of the junction, thereby offering a novel
zero-field functionality. Our key results rely on symmetry arguments, for
concreteness we demonstrate the implementation of our concept using a model of
moir\'e graphene-based c-axis junctions.
