As I recall you have the gear, Kevin, an AI and mic which you used to make the multi-track with your friends. Just feed that audio into OBS rather than a DAW, OBS Ninja to continue to record the video with your phone and you’ll be into exploring that next level. I described it here Producing a video with phone cam and an audio interface
As for the background, I’d not worry about that. As viewers we generally focus on the player, mostly the hands. And when not, there’s nothing wrong with the Pulp Fiction poster 