I can't quite follow what you're talking about Alex, but you should be able to get springs in the proper length and rate with few enough coils that they won't bind. It's just a matter of getting them.
As far as helper springs, I've run "keeper" springs that have essentially 0 rate. They compress completely flat when the weight of the car is on them. They only act when the car is at full droop in order to keep the main spring from coming loose. But like Dean said, you probably don't want that on a rally car that is going to droop frequently and needs a full length spring acting as the car lands. Really keeper springs are there just so you can jack a road car up and not have the main spring misalign when you put the car back down.
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