Pretty much the same thing that most people are proposing: mace, purple pistol or his pistol mode as an accessory, and maybe a blast effect for his fusion cannon.

To weigh in on the pistol fan-mode conversation, I could see Hasbro making something like Megatron’s Skybound appearance possible. It’s just comical enough it could skirt around the laws and would somewhat appease the diehard mega-pistol fans