It's totally do-able, although when we tried last year we pooped out before the summit. You'll spend more time at Muir melting snow than you think- it's a good thing. Rest is the only advantage that the average climber who stays overnight at Muir has over your style, as the body does not undergo any significant acclimitization during such a short stay at 10K. Lots of literature from Hackett, Wilkerson & others if this is a concern. I say have fun and lift a pint when you're back!