My domestic water has quite a bit of iron in it, so I filled my spa with the soft water to avoid the ugly stains. I am aware that I then needed to bring up the hardness and alkalinity to compensate for the sift water since very soft water in a spa can be the cause of future trouble, which I did with calcium chloride and sodium carbonate from the spa store.

Now for the question, I currently use Bromine for daily sanitization and the potassium monopersulfate as a weekly shock/oxidizer. I would like to switch to chlorine sanitizer since we are having some slight skin irritations with the bromine. We can use the di-chlor but I am thinking about using plain jane Calcium hypochlorite and here's why. The chemical I purchased to bring up the hardness was calcium chloride, fine. I am thinking the calcium hypochlorite granules (ther regular pool chlorine sanitizer) will be a good sanitizer, cost less and provide the hardness that my spa water needs without having to add additional calcium chloride. If I monitor the hardness levels (along with everything else on the test strips I use), I think I can get away with this as long as my total hardness stays with normal ranges. I am aware that excessive hardness can lead to scale buildup inside the tubing and I don't want this of course.
So, can I use the calcium hypochlorite as a sanitizer instead of the di-chlor and not have to worry about scale or other issues?

Your water supply will have a lot to do with the chemistry, and no one can say for certain on what will and will not work for each individual situation. As far as sanitizing, as long as you are getting your free chlorine levels in the target range, you will be fine no matter what form you use to get it there. The biggest difference between the different chlorinators is the concentration of available chlorine vs. the inert binders. Dichlor is more potent than trichlor. As far as your total hardness, just keep an eye on it with your test kit, and that will tell you right now if you are "getting away with it." In my experiance, a person rarely needs to bring the alkalinity up. Most of the time you have to keep bringing it down. This is largely due to soaps, deodorants, and such on the bathers getting into the water and throwing off the chemistry. You can safely use muratic acid to bring the level down if it's too high.