Answering about overlay word art, all the text boxes can be grouped together by selecting each while holding down shift button. Once all items are selected the drop-down arrow on the activated elements boxes makes the grouping option available. Select group. This creates an element of all the pieces you selected. Right click on this element, choose save selection as... Options for saving in png format should be available.
I am away from my SBC+ so I hope I got it right.