You would have a better spring that will last longer and ride smoother if you got the cheapest crap aftermarket spring vs what you're talking of doing.
You can get a very nice 4" Tuff Country EZ Ride lift spring set (2 springs) from Off Road Design for ~$350. What you're talking of will cost you $300
The savings $50 would not be worth it in quality alone, let alone longevity and ride smoothness, and flexibility
Mike