I listened to Bossa Nova's song again, in the drum, when you put a brush in, the atmosphere comes out, and the main instrument is the guitar. This is an instrument that can't be removed.
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I think you're right, when you hear the brushed drum and the guitar, with the proper rhythm, it becomes immediately obvious that it's bossa nova. Do you know the band Soutaiseiriron? They mainly play rock, but one of my favorite songs from them is mixed with bossa nova style. It's called Sawayaka Kaishine. I think it's an interesting twist of the Bossa Nova genre, just like yours