I appreciate that Shockwave is highly balanced/optimised and variation from it will be sub-optimal, but I can only make the gym M,W,F - how would you work it into a 3 day split?

My initial thought is to just work through the splits in sequence, maybe working the 'Core' stuff into the other days, so:

Mon	-	Chest & Bis
Tue
Wed	-	Legs
Thu
Fri	-	Shoulders, Tris
Sat
Sun
Mon	-	Back