I am a lefty and used Club Champion here in Birmingham, AL and what I liked is they use a 6 iron. In my humble opinion, if I can hit your hardest to hit irons which long irons the rest of the bag can usually come together. I would also stay away from 7 irons because the club manufactures know this is the testing club and are really jacking around that club’s basic design.
A different approach to demoing is buy single irons off eBay from a reputable seller. Make sure the seller tells you all specs before buying. Also if you know some of the basics of club fitting or some of your own sp