Why not choose the colors, get out the supplies, tape the room and lay down plastic. You could even do all of the roller work (just fill in the big easy spaces with a roller). Should take a few hours - totally doable. It's the damn trim, and the corners, and behind the toilet, and and and (I just finished a "quick" project...and it took be four times longer than I had planned - ha ha ha ha ha) that takes a LONG time. If he get's home, and much of the work has been started and the rest is just a matter of jumping in, perhaps he'd be more inclined to JUST DO IT. Sometimes, if a project is laid out and I don't have to figure out HOW to do it, it's a really straight forward thing I can just walk in and do, I'm more inclined to get it done. My brain doesn't do the whole, "OH NO! There's so much to think about and all I want to do is ______!)
With my husband, including him in the process is helpful. Rather than, "I want you to paint the kids room," I said, "I am going to remodel the kid's room," he said, "why would we do that right NOW?", I said, "it's summer and my mom will have the kids for a night. Also, it's a good birthday present for them, and it will increase the value of our home." He said, "Fine. But I don't want to have to do it." I said, "Okay. What color do you think we should do? I'll get it all started, and do most of the work, but are you WILLING to do some work too?"
Begrudgingly, he agreed. (Hey, it's progress for us ;-) It was helpful to have his hands at the end, and he ended up seeing where I was coming from as the project came to completion. In the end, he was glad he'd helped, and glad I'd done it. It's not likely, but maybe he'll remember that the next time I suggest doing something like this!