Hello again:
1/ Depending on the impedance levels and accuracy desired, yes a sense R for current can work, but the resistor must be carefully chosen and non-inductive.
The impedance of the scope input (eg 1 M ohm, 22 pF) and any cable ( eg 100 pF/foot of cable) or probes (eg 10 M ohm/10 pF will have a substantail effect above a few kHz, let alone 1..10 MHz.
Use the formulars for Xc, Xl, Z at the freqencies mentioned to find the residual effect of the probes, scope etc on the supposed test setup.
2/ Professional LCR/Bridges for high frequeny impedance measuements are often rackmount and cost many 100s..1000s $. We used Wayne Kerr 3245, HP 4262A, 4277A, 4275A, GenRad 1689 and HP 4195A Network/Impedance analyzer with impedance test fixtures...(see pix) .
3/ For hobbiest use, a handheld digital LCR meter is only $40..100. Test at a few kHz. Some are surprising accurate over the limited ranges.
4/ RE the Pearl Audio link .... third party, may cause issues.
original Voila! The latest version of this classic HP reference.
https://www.keysight.com/us/en/assets/7018-06840/application-notes/5950-3000.pdfBon Chance,
Jon