They are allowing having one SP open. So if you offer to transfer CL and close your current SP there shouldnt be problem.
I am pretty sure Dan and others have 2 open.
I recently had a WMC and applied for a visa trying to have both at once and was declined, I spoke to many reps, but basically the supervisor told me straight out having the visa AND wmc
wasn't the problem. They just didn't want an additional 5k exposure with my total chase line (I am young and relatively new to the game) so in the end I closed my WMC to open the new visa. But they made it seem like having both was possible.