You would mainly just replace D'Art with Solomon in the early floors, since she will fall of for you on the later floors to much to be effective and Mordred offers you some more stalling and control. So a major difference is not there, just maybe clearing it a bit faster for some more medals from turn-bonus. Reaching 10F is already a good goal and gives you a nice chunk of medals, so making sure to reach it is priority. I'd say, stick to what you already mapped out.