I would like to use a bell hammer on my scooter. I would like to use aluminum material with plastic pulleys and torque cams, which product would be best?

The recommended grease for use on torque cams and weight rollers is LS Bell Hammer Gold Grease No. 2.
It is slightly softer than regular grease, but it is widely used in scooter races such as Cygnus, Tigra, JOG, etc., and has a very good track record and a high degree of safety.