Limiting current in an ac op-amp circuit
I have found a very elegant (I think!) alternative to the current limiter circuit, in current-regulating diodes (CRDs).

Putting two CRDs, rated at x mA regulating current, back-to-back in series between the op-amp output and the load, works very well to limit the current to x mA, without impacting the ac performance. The op-amp of course struggles to drive the load when the frequency gets high, but this is unavoidable regardless of the current limiting method.

I used Semitec E-452, 4.5mA regulating diodes.

Highly recommended!