My treatment of the headmasters is that they're minicons that act like blackboxes for their partner, as long as either one of them remains the other can be rebuilt, additional idea for this character specifically is that the faction leaders are wearing special suits of apex armor akin to ultra magnus' deal, this guy has the power to make them
Here's optimus prime's head, apex
this one comes from the rarely mentioned generation 2, in my quest to make sure all the decepticons can fly, she turns into a flying submarine now
Here's aquablast















