I play a bit of chromatic harmonica - not as well as those guys
though!

That's one reason I'd love to have a chord sequencer like Korg and Roland have. To keep my hands free for the harmonica. But those seem to do OK with one hand on the harp and the other on the keyboard/accordion. For now I play harmonica along with simple backing tracks that I made. I will give a try playing one hand on each instrument. Thanks for the inspirational videos!