They make a QR "head" for monopods and I have one that I use all the time...something like this one (first I found at B&H) but you would obviously want to make sure it matches the plates you have...
And I agree with the XQD...I got to thinking about what my D4 could do at yesterday's game...My son had gotten hit in the head by a batted ball during batting practice and, though they didn't believe he got a concussion, it was definitely effecting him. I knew they were going to pull him and I knew they were going to have him bunt based on the game situation. I made a decision to see what the D4 could do...When the pitcher released the ball and already focused on my son, I hit the shutter...I released it after he touched first base - out of focus on the last as I didn't move as fast as he did during the 40+ shots...it didn't miss a beat...I was writing RAW to the XQD and JPEG to the CF...No, there was no reason to do it other than my curiosity but I was pretty impressed as I know it had more in the tank if I'd wanted to keep going!