Yeah, but . . .
If you study the dynamics of the circuit with the transistor,
it's "active" window is only a few hundred millivolts wide defined
by the signal level where the transistor first starts to conduct
until it is saturated. Only "glitches" that exist within that widow
are transferred through . . . with gain.
A straight divider/zener network has an active window of
about 5 volts but no gain. None the less, the "filtering"
feature we're looking for is degraded. I'm not saying that
it won't work . . . give it a try. But you may find that
the little extra gain and tightening of the window to
be useful and easy to do. By the way, since your signal
of interest goes below ground, the bottom resistor in the
schematic you propose is probably not necessary.
Bob . . .
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