I think that's fine. The 10 button accordion was used throughout the South probably before Joe Falcon got hold of one (though I'm not sure). Leadbelly played blues on the single row he called the "wind Jammer" before he picked up the guitar. Quebec musicians like Bottine Sourillante play it as well as Irish players like Johnny Connelly. Louisiana musicians put their wonderful twist on how to play the instrument and created a unique style around it, but it didn't originate in Louisiana. I've used the single row in Rock, Blues even Brazilian Forro. It works everywhere.
It may not be Cajun, but it's all good.