Pulp Cthulhu is a thing. It helps you create more action heroic characters for Cthulhu. There is even a campaign book for Pulp Cthulhu that I picked up and have heard good things about: The Two-Headed Serpent.
You could probably look at some of the adjustments that Pulp Cthulhu makes to the system and apply that to other BRP systems.
I have Pulp Cthulhu and also got the Two-Headed Serpent.
I have been playing in a Pulp Cthulhu game for a few months with a different group. I don't think it goes far enough in the "superhero" direction to appease Player A. This is someone who thinks 5E characters are too weak.