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Yes it's possible to use 2 STBs via a special communication protocol (Twin Protocol) that allows the 2 STBs to communicate via the RS232 cable. The STB connected to the Data Satellite is called a dongle. I embraced this technology around 2011/2013 using the famous Microbox, Morebox and Atlas Cristor Dongles among many other dongles that served that purpose at the time. The Principle used is pretty much similar as for S*S sharing using double-tuner STBs. Twin Protocol is activated in patched software & makes it possible for the "slave STB" to receive data in form of CW keys from the dongle.
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Note: SKS data is locked and can only be accessed by STBs with access keys embedded in specific software.