Agreed. The four you mention are decent as wide options. Knockaert is the best finisher so logically should be the number 10 as they will get the most chances.
If we go for March and Skalak on the wings, I might go with Skalak on the right too having thought about it. If Skalak can cross on his...
Once everyone is available, I think it will be March on the right, Skalak or Murphy on the left and Knockaert in the number 10 role behind Murray. Knockaert already has 3 goals this season and is possibly our best finisher (along with Murray). Makes sense to me.