There’s no point in doing this for MaidSafecoin (the proxy token) because the time-scale is only around three months, so I think this only relates to Safecoin which exists on the network.
So I think your suggestion is really about trading between Safecoin and other currencies once the network launches, for which you solution would be one option, but the Mastercoin/Counterparty comparison will no longer be valid and there are likely to be exchanges set up on SAFE as well as multiple exchanges trading Safecoin directly.