Yes, you can do this by copying each button to the MSO state in the same place as the original button and pointing that copied button to the invisible state. When the state is selected, the copied button then pops on top of the parent button. Here are the basic steps:
1. Create your MSO with three states: Base, State B, and State C.
2. Create two buttons next to the MSO. One points jumps to State B, the other points to State C.
3. In the Object States panel, select State B. Select the first button, copy it, and paste in place. With the pasted button still selected, Shift-click to select the MSO, and then click the Add button (not the New button) to add the button to State B. Then edit the button to jump to the Base state.
4. Do the same thing with the other button.
5. Test.
