arXiv:2611.09292v1 Announce Type: new Abstract: Tensor-product splines mapped from a square to a disk-like domain form a discrete de Rham complex, but at the coordinate singularity the pushed-forward $0$-, $1$- and $2$-forms are discontinuous, unbounded and not square integrable. Existing polar constructions impose either high-order regularity on the $0$-forms only, or first-order regularity on the whole complex. For general disk-like mappings composed with a smooth diffeomorphism, we construct polar subspaces of all three tensor-product spaces that are conforming, form a cochain complex with the cohomology of the disk, and are $\mathcal{C}^{\mathfrak{r}-m}$ at the center for $m$-forms, for any $\mathfrak{r}$ up to the spline degree, under a compatibility condition between the mapping and the angular basis. The construction enriches the $2$-form space with projected polynomials and lifts them to curl-like $1$-forms by Poincar\'e-type homotopy operators, which reduce to cumulative sums of radial B-spline coefficients, so that the homotopy identities hold exactly. The same operators yield sparse commuting projections that preserve total flux and circulation, and boundary-compatible homotopies that solve the curl--curl problem with a single mass-matrix inversion. In 3D, the tensor product with a periodic 1D complex carries all properties over to stellarator-like solid tori. Numerical experiments confirm optimal projection accuracy and the predicted regularity, show that the regularity conditions suppress the stiff central modes of the curl--curl operator, allowing more than ten times larger time steps than first-order polar spaces, and that compatible high-order regularity is required for convergent guiding-center orbits near the axis of a discrete vacuum field.