The next generation of double polarization experiments at the Bonn accelerator facility ELSA with the Crystal Barrel Detector and the Bonn Frozen Spin Target will be performed with an elliptically polarized photon beam. Elliptically polarized photons allow the simultaneous measurement of different polarization observables in one target-detector setup. In order to exploit all the possibilities of this approach, the Bonn Polarized Target Group has developed a new concept for an internal holding coil for the frozen spin target, a so-called combined holding coil. This magnet design allows a variable field orientation between 0° and 90° and thus an individual polarization orientation between longitudinal and transverse target polarization during data acquisition in the scattering experiment. In the following we report on the current activities of the Bonn Polarized Target Group on the topic of internal superconducting holding magnets.