This isn't analogue modelling though -- you're just using KVL/KCL to derive the transfer function H(w) and applying the same transfer function as a digital filt

This isn't analogue modelling though -- you're just using KVL/KCL to derive the transfer function H(w) and applying the same transfer function as a digital filter. It's literally the first thing I would do if I wanted to come up with something that sounded the least bit like the real thing. I was using my own FIR derivation of a third-order low-pass Butterworth filter to do software synthesis in 2008 while I was in high school. This is truly basic stuff. Real analogue modelling has things like noise, hysteresis, and a dependence on such broad factors as temperature and even EM fields.