Its not Sling's fault that the HDCP copyright protection is in place, and it would be illegal for them to do anything to bypass it. It's built into these cable / sat boxes by design to prevent copying through digital means. Component and Composite ( scart ) are analog, thus as long as sling has a product, it'll follow the HDCP copyright laws and as long as HDMI remains digital, you'll always need to find a way around this protection, whether that be using something like the HD fury or settling with the composite connection with a reduced quality in picture.
An HDMI splitter will only work if you have the HDfury. The hdmi connection coming out of the sat box going into the splitter would allow the HDMI signal to successfully go to the TV because it handshakes the HDCP signal with the TV, but the minute the sat box tries to do the same thing using the splitter to the slingbox with a standard HDMI to component cable, it will block the signal. I'm afraid if you continue to want HDMI to function, then the HDfury is your only option, but IMHO there are other benefits to the Pro version over the solo that make it worthwhile.