Different tempo markings for different parts

I am trying to write for two pianos similarly to Steve Reich’s piano phase and am wondering if it is possible to have an accel in one piano part while one stays at a tempo. If not, would it be possible to have two staves playing at different tempos?

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It might be possible if you are able to determine the precise ratios ahead of time, because it will undoubtedly involve some absurd hidden tuplets, as well as extensive use of the ‘pickup trick’ to make time signatures show something other than their actual value. But it’s hard to say without knowing more of the specifics. In any case, no, you can’t have two different sets of tempo information running alongside each other.

Keep in mind that Reich’s Piano Phase itself doesn’t attempt to notate the phasing effect either, just showing the intermediate steps. I wouldn’t know how to do those dotted staff lines in Dorico but other than that this is quite conventional notation with a lot of explanatory text.
PianoPhase

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