Just in case you are interested, there is information below about a 6v solenoid-starter for a truck. I would use the foot-actuated starter.

A 1954 6v Hydra-Matic solenoid-equipped starter is available from Chevs of the 40s for about $270 (including a $100 core charge and the solenoid).

The "snout" of the Hydra-Matic starter (the part that goes into the flywheel cover) is different from the "snout" for a truck clutch housing. I do not know if the "snout" and drive gear for the Hydra-Matic will match up with a truck flywheel and clutch housing. It works on 1954 (and other similarly-equipped 6v years) passenger cars and Dubl-Duty trucks and Hydra-Matic-equipped trucks.