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@gbj_tester
It will work, based on what we know about pivotless Ti chainstays of soft tail MTBs there should be no material problem with moving about an inch in chainstay length. On the other hand, deliberately introducing a weak joint in the middle of highly stressed chainstays seems like a dumb idea; it's at least as ugly as sliding dropouts or an eccentric BB and just as susceptible to the kind of creaking which has been adduced as a pitfall of the EBB. With careful design, it's not even necessary to employ either an eccentric BB or a calliper mounted on sliding dropouts to fit a disc brake to a single speed. The total rangle of movement need be no more than ½", and putting the calliper centre directly over the axle centre will permit that without any further need for adjusting the calliper position, since moving the wheel back or forward ¼" generates an effective change of calliper position of just 0.2mm radially and 4° in angle, well within the tolerance for calliper mounting.