Interference with the add-in's ribbon is not possible (or at least immoral  ). As I mentioned earlier, you can disable the add-in.
 ). As I mentioned earlier, you can disable the add-in.
This macro lists all COM add-ins installed in Excel and indicates whether the add-in is currently enabled. When working with programmatic enable/disable COM add-ins, use the progID property, not Description, although the latter is more human-friendly (but is prone to language conversions). 
	Sub OverviewCOMAddIns()
    Dim addIn As COMAddIn    
    ' Results in the Immediate window
    For Each addIn In Application.COMAddIns
        Debug.Print addIn.progID, addIn.Connect, Chr(34) & addIn.Description & Chr(34)
    Next addIn
    Debug.Print String(35, "=")
End Sub
 
To enable/disable an add-on, you can use the following function, which returns True when the action succeeded. 
	Sub Test()
    If SwitchCOMAddIn("PowerPivotExcelClientAddIn.NativeEntry.1", True) Then
        ' is OK
        Stop
    Else
        ' Something went wrong
        Stop
    End If
End Sub
Function SwitchCOMAddIn(strprogID As String, blnConnect As Boolean) As Boolean
    Dim addIn As COMAddIn
    On Error Resume Next
    Set addIn = Application.COMAddIns(strprogID)
    On Error GoTo 0
    If Not addIn Is Nothing Then
        If (Not addIn.Connect) = blnConnect Then
            addIn.Connect = blnConnect
        End If
        SwitchCOMAddIn = (addIn.Connect = blnConnect)
    Else
        SwitchCOMAddIn = False
    End If
End Function
 
Artik