This sounds like a great idea.
Another suggestion which would also save you money would be to try to figure out (with help from a knowledgeable Revlon CS person or maybe a hairdresser) which color and level make up strawberry blonde and mix your own. Seems to me it would be blonde + red but of course it's a bit more complicated than that.
Buying a bottle of color (or more than one color) and peroxide and mixing yourself is not hard at all and it's more economical than buying those kits. (This is assuming you're using permanent color, not the kind that washes out).