So is there no instrument that can be acquired without breaking the bank for nonEE to broadly measure impedance, or in this hobby where snake oils are rampant does everyone blindly except vendor claims?You need a sine wave generator and probably a 100 ohm potentiometer in addition to your meter.
The sine wave generator drives the speaker, which is wired in series with the potentiometer; the latter only uses the center lead and one other lead.
Set the meter to AC volts.
You adjust the pot so that your meter reads the same voltage across the speaker terminals as the across the pot. Then remove the pot from the circuit and measure the DC resistance- that is the impedance of the speaker at that frequency.
So you need to do this a bunch of times but with a bit of graph paper you can draw up the impedance curve.