Hello, you are asking the same questions we have all had.
I can help you with one part. When I am working on a vintage razor trying to restore the bevel I almost always use a piece of 1000 grit wet/dry sandpaper placed on the top of the hone. It is fast and cheap. If necessary you can use a lower grit to remove a large nick in the blade.
You can also use some of the finer grit sandpaper to further refine the bevel if you wish. I usually go from 1000 sandpaper to a Norton 4000.
How the DMT would handle this transition I do not know. The Norton 4000 handles this just fine. Hopefully someone will chime in on this point.
If I were starting over I would skip the chinese 12k and first buy the 4 sided paddle strop with 3, 1, 0.5 and 0.25 pastes. Actually I would use the 1 and the 0.5 on a 2 sided paddle strop. That will do a lot for finishing or refreshing an edge. The 3.0 I have never used ( no need to, the 8000 serves for that grit size) and the 0.25 is just to sharp for my skin.
Some others will argue for the belgian coticules and blue stones. They are also very good stones to consider.
Hope this helps,
