I understand boeing does not support two-step rotation techniques, like the one you mention, but it sounds like a good one.
It's not necessarily a two step process. Rotate using normal technique but do not exceed the takeoff pitch reference line that's on the HUD.
T.O. pitch reference line is at 8 degrees until 10' RA, at which point it increases (@ 3 degrees per second??) until V2 + additive logic takes over.
It you do not exceed the takeoff pitch reference(limit?) line you will not have a tailstrike.