Will the changes be for better or for worse? Depends on what you like. Pretty much need to try it to know for sure. And even then, you may change your mind later, as your tastes in sound and playing properties change over time.
I've fiddled a lot with furniture, and my advice is to have a good luthier set them up. After my attentions, my violin sounded terrible. There are variables that aren't common knowledge. Like, distances, densities, etc. When I finally got my luthier involved to set up furnishings, it got done right. What a difference in tone! You didn't mention tail-gut, which can also have a huge influence.
The furnishings on my violin include a Pernambuco tail-piece (standard length and weight), a single Hill-style tuner for the E string, and a Kevlar tail gut. Kevler was an improvement on a titanium tail-gut.
Of course, a lot depends on the violin. But, this is the setup my luthier thought best for my particular violin.
Maybe it's more of a U-shaped curve, where the advanced player can then get back to tinkering and get something out of it.
Apparently aluminium is a very efficient sound transmitter on account of its low density. But I gather the impedance of the bridge needs to be higher than that of the belly so aluminium's may be too low.
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