Amp modelling is a funny thing :)
But I spent the night thinking. (Diff timezones.) Even in my dream I was cruising around guitar stores to find the answer, or sitting above the plannig table to find something out. So I just think that I gather my resources and try to build a thing similar to a noise gate. Well, the principle should be the same. I could make it digitally with a DSP, but that would be a daaamn long way, though I'm sure the best. Maybe later. Now I'm only planning on making a non-linear circuit.
But anyway, if you've spent thoughts about my idea, please tell me! We always learn, I'm grateful for every ideas!
Lordatthestrings: Thanks, I checked it, yet didn't find anything useful. They deal with deterministic noise subject to grounding, gear fault, etc. Mine is kinda radio related or MAY be related to ESD.