I’m considering upgrading my speakers internal wiring

The best speaker designers on earth themselves are quite humble, constantly learning and revising things. So, Peter and his speaker are not set in stone. Peter himself may have a lot more to learn like other designers. So, you can go to town with the tinkering and not worry about "upsetting" Peter (good grief, facepalm). He got paid and they are your speakers now, i.e., you can do whatever you want with it.

A simple upgrade for many speakers could be to try slapping some no-rez sheets inside the cabinet, see what it does.

https://gr-research.com/product/norez-two/

Consider joining groups like the ’high end loudspeaker crossover upgrading’ facebook group. You’ll find more detailed posts, schematics, pictures, etc and those nerds could help sort you out, if you got stuck or something (i.e. if this type of tinkering becomes your near-future venture). Such info and dudes are also scattered around in the diy audio forums.

Think of it as tube rolling, op amp rolling ,power cable rolling, speaker cable rolling, etc whatever....You are just ’rolling’ your internal crossover and wires now. Some ’rolling’ attempts could fail and you could always roll back to Peter, in such instances. Some rolling attempts could one up Peter’s design...that’s how it works.

What carlsbad2 said.  Even expensive brands can have surprisingly mediocre wire and caps in the crossover.  I’ve seen the insides of dozens of speakers.  Have fun.

Years ago, I replaced all the wires in a Dahlquist DQ-10’s, a 5 way speaker system. When all was said and done, I removed most of it because it didn’t sound as good.  However, I did leave the 12 gauge wires to the woofers, because they made a very big improvement in the sound. For what it’s worth, the wire I used was silver coated copper.

Go for it! They'll be your "forever" speakers; especially since nobody will want to risk buying them with your mod, if they like speaker's OEM voicing.

i spend a lot of weekends at a local shop that makes its own high end speakers.  After the basic speaker is made, there is a lot of time spent tweaking the speaker, including making adjustments based on the specific wants of a prospective buyer.  There have been many times i heard quite dramatic changes made to the sound based on the prospective buyer's preference, and not all such changes are to my liking.  But, the point is that such small changes DO change the sound.  Such changes include changes in internal wiring, as well as crossover parts and even binding posts.  This builder often puts truly crappy looking binding posts on his amps and speakers because they sound good to him.  Some customers insist on something fancy, like WBT silver binding posts, and he will do it, but then have to compensate elsewhere as best he can to get back to the sound he wants.

Any such tweak, to the extent that it actually changes the sound, has the capability to improve or hurt the sound.  It comes down to a trial, and one should be willing to accept that the trial may not work out well and one has to reverse the operation to get back to the starting point.  One would then have to decide if another experiment is in order.