The value of SBD is inexorably tied to the value of Steem, but the relationship is one-sided (SBD can be exchanged for Steem but not vice-versa). This might not be true, however, if the conversion option described in the white-paper no longer exists (the option was available on the Steemit wallet, but no longer exists). Based on my research, it might still be possible to convert SBD to Steem through Python.