That energy cost is intrinsic to aluminum casting. If you’re recycling aluminum like this, you are going to have that cost anyway - even if you use a different

That energy cost is intrinsic to aluminum casting. If you’re recycling aluminum like this, you are going to have that cost anyway - even if you use a different technique like rolling or pressing or extrusion to form the final pieces (that said I bet induction heating aluminum scrap to melting point is a lot less efficient than heating an ingot)