Just practice the 21-15-9 with the 225 DL. It doesn't sound like it would that hard just doing it on it's own but it is. There's another variation that has handstand pushups inbetween the DL's. I'm just trying to get the 21-15-9 with those before I try this again. There's really not a good place to do box jumps in my current gym, I'd have to walk about 30 yds in between sets to go to the basketball court bleachers, so I don't do much with box squats unless I sign up at the crossfit gym for a few months. If you can train your met con to breeze somewhat easily through the deadlifts, than adding box jumps won't be that bad. I'm stunned at these little dude's who can rep 315 out like that and then go do 30' box jumps.
I don't have 225 at home. 35 & 53lb KBs plus a jump rope. I'm going to buy a pair of red 55's and 25's when they sell the used Games gear in a few weeks. I like those because they say "The Fittest on Earth"