Whale,
buying a piece of maple will do you no good. You need to use a piece of the wood you are going to stain. Each piece will take stain differently, so it's imperative to use a scrap from the stock you have.
LMF stains can be diluted with denatured alcohol. Try 2:1 and try the stain, as you said, you can build up to the color you want.
Good luck.