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I did a test of 400 games with a single Rook -> Adjutant substitution, and
the Adjutant won by 63%.

Then I did two 600-game matches giving additional Pawn odds to the
Adjutant (deleting f2 or f7). One where I set the Adjutant value slightly
above R+P, one where I set it slightly below. They ended in 52.7% and 52.3%
victories for the R+P side.

So it seems a single Adjutant is worth almost as much as R+P. Note this is
opening value, and that the opening value of the Rook for me always tests a
little bit below the classical 500, though. There was no pair of Adjutants
in this test, but there was a pair of Bishops. So the empirical value might
include some Bishop-Adjutant pair value.