The card reader built into the VU+ Uno 4K SE is not specifically a Viaccess reader. To watch Swiss channels with the SSR SRG card, you need to use the CI (Common Interface) slot with a CI+ module or a specific module compatible with Viaccess.
You can therefore use the CI slot with a CI+ module or a Viaccess BIS READY module to decrypt Swiss channel signals.
Mine only has a SAT tuner, and there are various features to look out for. I use an HD+ card directly in the slot. Sometimes you have to install different software. Info in the forum.