Everyone of you might remember the Autobot communicator, Blaster from the Transformers G1 cartoon. Since he’s a boombox, why not hex Scout’s boombox into Blaster? Sorry that I’m not an expert on hexing source models, though.
Here’s what he looks like in his boombox mode-
And maybe thrown in Twincast from the Headmasters series for the Blu Boombox since he’s blue.