Concertina Connection Shows the Troubadour at 6 1/4" across the flats, but doesn't list the same size for the Elise. One option the Troubadour has is Wakker bellows> Wakker bellows will be much more supple.
During the Academy Awards broadcast Jimmy Kimmel mentioned that Robert Downey Jr learned to play the violin left handed for his portrayal of Chaplin. Quite a feat, I'd imagine, and not at all concertina related.
Wikipedia has an interesting page about Ora (or Aura) Lee. I had to listen to your video again, Jody, to hear Elvis' Love Me Tender. Nice song, Ora Lee!
https://en.wikipedia.org/wiki/Aura_Lea
Shopgoodwill.com mostly shows inexpensive, Chinese/Italian made 20 button instruments. Occasionally, an EC or good quality 'tina appears, so look regularly!