  We formalise the teleparallel version of extended geometry (including
gravity) by the introduction of a complex, the differential of which provides
the linearised dynamics. The main point is the natural replacement of the
two-derivative equations of motion by a differential which only contains terms
of order 0 and 1 in derivatives. Second derivatives arise from homotopy
transfer (elimination of fields with algebraic equations of motion). The
formalism has the advantage of providing a clear consistency relation for the
algebraic part of the differential, the "dualisation", which then defines the
dynamics of physical fields. It remains unmodified in the interacting BV
theory, and the full non-linear models arise from covariantisation. A
consequence of the use of the complex is that symmetry under local rotations
becomes as good as manifest, instead of arising for a specific combination of
tensorial terms, for less obvious reasons. We illustrate with a derivation of
teleparallel Ehlers geometry, where the extended coordinate module is the
adjoint module of a finite-dimensional simple Lie group.
