I'm guessing you have a heritage special and don't like the cable?
Those carbs can be modified with the choke rod from a 80-81 carb set.
Sometimes they come up in the classified section and on e-bay.
I've wondered about modifing the cable rods with balls, springs and indents on the back to hold it so instead of a pull rod it would be a push rod. But setting and thinking about is as far as I've gotten.
If I have assumed wrongly then add some more info and someone will come along to answer.