Sorry if this is a little confrontational. I'm just going to be honest.
my hunch is that he expects me to show up at the end of the week and do this with him.
I would have the same inclination. This scheme is your baby. You thought about this for a year, researched it, learned enough about it to create documentation, and just dumped it in his lap.
My current inclination is to not do so unless he asks me outright, and let my manager decide who needs to give on this one.
I don't understand this power-struggle. You are proposing a large change to the workflow of your organization, but for some reason you are adopting this strange passive-aggressive stance where you refuse to help your colleague, and want your manager to brow-beat him into doing it your way, without any assistance from you, before you have even tried it. Sorry, I don't get this.
Is this the best course of action?
No.
I'd like to see my new process in swing before I leave.
Your ship is sailing. Your colleague doesn't share your vision, but is willing to to try it (with your guidance). So, if you want this to happen, then drive the extra hour and try it out. Buy some snacks and sodas or something that you guys can share as you bring all the pieces together and help him through the process. Then watch the magic happen, and his eyes sparkle as he begins to catch the vision of the future. Then leave on a good note.
(I wouldn't be surprised if the process is a little harder than you assumed, and there is some unanticipated "gotcha" midstream, and he is going to need your help anyway)