Apparently there was once a foot-operated bellows double reed bass that sounds a bit like the bass harmonica.
Belgian bandoneon builder Harry Geuns is making these instruments again. Check out the page at his website, adn be sure to scroll down for the sound samples.
You could acoustically play reed bass to your own harmonica playing . . .
http://www.bandonion.com/footbass_1.htm
Winslow
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