I had a 2003 very early 6.0L that broke the tip off #8 after giving light black/brown overfuel smoke for a couple of days.
This can be a combination of 'running the injectors dry' (with low or no fuel) followed by excessive volatile or water content in the fuel, which expands and cracks the tip. If the engine is warm, the excess passed fuel will volatilize nicely due to the cylinder compression and produce the grandmother of all white smoke screens: you will NOT want to be near any ignition source if this happens!
By the time I could get a borescope into Numero Ocho I could see no visible trace of a broken tip, the mechanics' consensus being that it had gone out through the valves and turbo without jamming. If you see that a piece is 'gone', though, check carefully in the combustion space (including in any gap between the crown and the top ring) and I recommend that you look for scoring with #8 at BDC and all the fuel out.
I think you are wise to have all 8 done at once, with a quality 'remanufacture' that carefully drills the nozzle tips accurately. Be sure that whoever does the work understands what the DLC was for and has provided equivalent 'protection'.
Be aware that significant fuel went into the oil system. I would flush it carefully with ordinary oil, perhaps a couple of times, either with a cellosolve solvent or something with affinity to light fractions, to make sure that any fuel is out of the oil film areas.
Incidentally the 'hack' to get the engine out without a cab lift was carefully documented as a service procedure (it involved, at one point, something iike 17 wobble extensions in series to curve around the bottom of things to reach ta couple of the bottom mount bolts) and is a bit similar to the Audi 'hinge' approach to get the whole front exposed. Be prepared, though, for a lot of removing and then a lot of replacing. I wish I had a copy of the instructions where I could post or PM it.