Sending aid before Spain's Carlist split

Should volunteers be sent before the Spanish player switches to the Carlists?

The Spanish player says volunteers have followed his new faction when both countries are human-controlled. He needs rifles immediately, in quantities his convoys can carry.

The planned Carlist break raises a question about whether foreign volunteers should arrive before or after the player changes faction. The Spanish player's experience is that volunteers follow his new faction when both countries are human-controlled. With the next war about a hundred days away, rifles are the immediate priority. The request is limited by how much the convoy fleet can carry. The prospective supplier plans to produce more guns after deploying enough divisions to restore his own army.