Using MC4x to drive Pulsar 75 hz coils (retrofit of coils)

The instruction book recommends NOT using an MC4x for 33/75 hz Pulsar coils.

I have an application where we are using an MC43 driving PF coils, and the customer is asking for a retrofit to 75hz pulsars, for common coils with other equipment.    Is it possible to add external diodes/etc and drive these coils, or will we have to replace the controller?