Sturminator
Love is a duel
I'd let Martinec run his own PP, he was an excellent playmaker and had tremendous hockey sense and vision. I'd put a net crasher with Denneny and Keats, and moved Martinec down to 2nd PP unit to run his own show.
Having two puckhandlers on a powerplay is fine, and I see no reason why Denneny can't be your slot/garbage guy. In fact, I think he's perfect in that role. I think Denneny - Keats - Martinec looks good. Don't forget that your top powerplay unit can realistically eat up 75-80% of your man-advantage icetime if you want it to. Top powerplay skaters hit those numbers all the time, as it's not terribly strenuous playing keepaway. You want the most possible talent on the ice for your first unit powerplay, and I see no reason why over the course of a season Keats and Martinec couldn't learn to work together.