Maybe there is a way - can I suggest, 1/. Reduce power but do not hold att.
2/. aircraft starts to descend following reduction in power - ad nauseam.
Voila! There we have a descending aircraft into air which is becoming increasingly more dense with reduction in altitude. Balance the ROD with the reduction in power. So that the lift over the wings . . . . well, you know what I mean.
. . . .Alas - too late !
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But what if you synchronously, infinitesimally lower the nose and reduce power in a synchronised manner at the same time ?
Thereby reducing pitch and altitude while exactly maintaining speed (IAS) and solwly but surely reducing Mach number ?
Admittedly a purely theoretical excercise.