I understand that you want to know if is there any other connection you can use between your Slingbox SOLO and the Dreambox DM800SE PVR, instead of the Scart connector.
Checking the information about the Dreambox DM800SE PVR and I could find that it supports the Scart, HDMI and coaxial connections. This means that you only have the coaxial connection as a possible option.
On the other hand, you can also take into consideration the option to upgrade your PVR to a digital unit. This way, you will be able to choose between the Composite and the Component connections, which will bring you a better video quality. Finally, you must know that none of the available Slingbox models do support the HDMI connection due to the High-bandwidth Digital Content Protection (HDCP).
Hope this helps.