Application of a magnetic field along the [111] direction of the spin ice Ho2Ti2O7 confines three dimensional spin ice physics to a stack of kagome lattices, resulting in a 2D Coulomb phase with algebraic spin correlations and modified ice rule. The kagome ice spin configurations map to the honeycomb dimer model originally studied by Kasteleyn, in which an unconventional phase transition was predicted as a consequence of modifying dimer activity on different families of links. In kagome ice, this effect should be achieved by tilting the magnetic field to modify the degeneracy of the spin configurations. A universal scaling of the algebraic correlations as they are tuned toward the transition as a function of field, temperature, or tilt is manifested by the drifting of diffuse features in the structure factor. Earlier diffraction experiments on a large, untilted, but irregularly shaped crystal revealed a structure factor characteristic of a tilted crystal, suggesting that the demagnetizing field can complicate observation of the scaling. We propose an accurate investigation of the scaling,using crystals cut to minimize the demagnetization factor and a precisely tiltable mount.