If you’re incorporating this into a GPP as part of a sprint program, Charlie would be the one to ask. It will depend very much on your training level and how this will fit into your overall plan. For posterior chain, I like squats, box squats, RDL’s (performed explosively) and GHR’s. Wide stance does hit the glutes and hams a little harder than narrow stance, but again, ask sprinters here for their opinion, as some believe wide squats may effect sprint mechanics.
5 x 5 should work if you limit the number of exercises to two, and yes full deadlifts would be difficult and not high on my list for a sprinter.