I just bottled a saison that I brewed as an experiment: 1) extract, since I haven't made an extract batch in a couple of years, and 2) adding a 1/2 lb of crystal 40, since I've never tried crystal malt in a saison and wanted to see if I liked the flavor. Those ingredients got me to about 7 SRM, and with 2 ounces of Midnight Wheat at 550 L, I reached 12 SRM.
The saison attenuated down to 1.010, not terribly shabby. I can't comment fully on the flavor yet, but I can recommend 2 ounces of Midnight Wheat for an easy color adjustment. There is virtually no flavor contribution in such a small amount. Even a saison made from 100% belgian pilsner will reach 10 SRM if you add 2 ounces of Midnight Wheat.