For my quick tests I generally only worry about Z1 and Z7... film speed and development time.
I do have a densitometer but am often too lazy to warm it up. I have a sheet of film that I know reads 1.2 that I keep on my light table for quick visual comparisons to my test Z7 and I have pretty good memory recognition of Z1.
As you are using the Zone system I assume you have a spot meter. You can use your spot meter as a quick rough density checker if you have a good size piece of film at a known density you can put on a light table. Make a snoot for your spot meter to block flare light from the light table.