Is there a solid fuse-like item that I can use in place of a fuse, to bypass it?

Then you may next consider, as I've read a couple here have supposedly done, wire your amps straight into the wall ... 🙄 (don't)

It appears the amplifier i’m using has two 7A fuses accessible from the outside, and 5 or 6 lower amperage fuses on a PCB in the amps power supply.

In a potential sound-enhancing compromise, I can replace 5-6 lower amperage fuses with solid copper cylinder shaped objects, and leave the two 7A as is...for safety...

...but actually perhaps swapping the 7A fuses also, for some aliexpress "Fever-grade" fuses that make extravagant promises.

The fuses are there for protection, so I would not bypass them even if they are not high amperage circuits that are being fused.  Why risk ANY damage to the amp at all?  Clearly the designer thought it was important to protect these circuits and you would be second-guessing as to whether the designer was being overly cautious.

If you think it matters that much, bite the bullet and buy exotic fuses; don't by-pass them.

Can't fix stupid.