I was thinking along the lines of an 11-12-14-16-18-20-22-24-26-28-34-40. This is similar to what 3T is doing with its “bailout” cassette but since its 12 speed you effectively get a relative tight 11-28 10 speed cassette with two bailout gears for steeper hills (spin to win!).
Rotor’s supposed to launch 12 speed cassettes along with its 13 speed group next year. The general purpose road 1x12 cassette will be 11-12-13-14-15-17-19-21-24-28-33-39. 13 speed version adds a 10T cog, but requires a special hub. 12 speed Rotor cassettes are supposed to work with a standard Shimano/SRAM 11-speed freehub.