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I think I've actually found what I was looking for — posting for anyone who hits the same question later.

Short answer: yes, PSS®E has an equivalent — the native library model PLBVF1. It's formally a generator model, but it has no swing equation, no AVR, no governor — it just plays back internal EMF voltage and/or frequency straight from a file. Needs nonzero ZSORCE (same idea as a PF source with internal impedance), Pgen=0, Vscheduled=Vinitial. The .plb file format is Time, Voltage, Frequency — you can drive both signals independently or together, step or ramp, from one file at the same timestamps. No Change Vref/Gref, no shunt/fault tricks needed.

We've tested it live pretty thoroughly (shallow and deep V dips, isolated F steps, combined V+F with no cross-coupling) and it holds up well. One practical gotcha: for very deep instantaneous V steps (roughly below 0.3-0.4pu, depends on your dispatch point) you can hit ordinary SMIB transient instability (pole-slip) — that's not a PLBVF1 defect, just equal-area-criterion physics. Fix is trivial: use a mild ramp filter (Tv ~5-10s) instead of an instant step for anything that deep.