IMHO the best solution is BW400CN or XP2. Since these are black & white films that are developed in color chemistry you can get away with quite a range of lattitude in the same developer and time.
For myself I work mostly with two black and white films in 35mm. TMX100 from ISO64 to ISO200 and Delta 3200 from ISO800 to ISO6400. While that does simplify my film stocking unfortunately it doesn't help you much. I still develop at different times depending on the ISO I used, particularly with Delta 3200.