I'll go even further — most active riders are ready to play both SoD and VT; the orthodoxes of a single version mostly stay home. I won't attempt to explain the reasons, I'm simply noting it as a fact.
Plus, there is the difficulty of predicting the number of participants — not once in any CIS event has it been possible to compile an accurate list even a week in advance; many players signed up or withdrew at the last moment, often without warning. The option of sorting out who will play which version among those who have arrived seems bleak to me.