Have a set of stock Tone Stacks that match the characters of popular amps.
When setting up or after a capture, allow the user to select their desired tone stack.
For Preamp captures, it would even support amps that have some eq pre and some post preamp. For full amp captures, the eq could be pre preamp.
so if I capture a fender blackface, the selected tone stack would at least be in the ballpark of real amp expectation.
Or if I love the mesa tone stack, I could try it on any amp capture.