Looks like I pulled it off. The only thing I am not totally confident in is the torque on the high pressure connectors. I'll order the Snap On crows foot referenced above and follow up with that torque.
I spent quite a bit of time cleaning the top of the head, and each bolt hole and injector bore and seat. I used a small caliber rifle brush for the bolt hole and lots of cleaner and chasing it with a bolt followed by compressed air. I used the factory plug, bore brush and seat brush to clean the injector bores. I was able to use the factory puller on two of the four injectors, but had to use some prying and luck to get the other two out. I saw a good video of someone using unistrut across the head with a through bolt to the injector which was my back up plan. Everything clean, greased (maybe too much) and assembled. Couple of good hard test drives just now and seems to be running great.
I was quoted $2000 - $5000 by the dealer for this job. Seemed simple, but risky with the bolts potentially breaking. I spent lots of time prepping and it all came apart ok.
I think I have $350 in tools, parts and consumables. It took about two days to do the job, with lots of back and forth with prep and cleaning. Probably 8 hours total labor.
Thanks a lot to everyone in this thread, and the Sprinter YouTube contributors.
One of the worst offenders, after cleaning the surfaces and pulling the injector -
After final cleaning and prep. You can see the brass plug still in the injector opening -
Tools -