I'd say something edgy about paying attention but that wouldn't be nice.
Your time and money is worth more than trying to make some open source diy kit printer do what you want. Bambu has body slammed the market with printers that work.
Get a H2S or X1C, run it in lan only mode if you're paranoid, and don't look back. H2S is a better option for your material choices.
My comment will probably get flamed because I'm not saying Prusa makes the best printers and only support open source, but do you want a tool that makes things, or do you want to waste time baby sitting your tool trying to get it to do something others can do out of the box.
I WISH my machine was open source, but the reality is it's not. It's like asking what mill to buy, but rulling out HAAS and Bridgeport because you're ok with trying to machine around crazy slop.
Your definition of good, is my definition of a prison.
I guess you can do some of it using a Windows port of JACK Audio or something, but this isn't trivial to get working - and would still pale in comparison. Why it still is so difficult to route audio in Windows is beyond me.
To give a bit of context; I can sit in a Teams meeting using compressors and saturators and whatnot to make the audio better and put any amount of VST plugins in the chain on my own microphone. At the same time I can mix the output from an ambient track from Spotify with audio from liveatc.net and stream the whole thing to an Icecast server while ripping everything to a file.
Trying to do the same thing on Windows will just drive you insane.
I use SoundSource because without it digital audio has audio levels locked, which is also asinine. We have to admit, audio control on Macs is straight up garbage, and having to buy third party tools to do something the other major OS does out of the box is not a good look.
Is this a situation where if you abide by the letter of the law without tech it doesn’t work, where if you use software and/or route through nations that already have no tariff deals with US you get your items through?
I just bought (last week) an EEG kit from Europe to US for personal sleep studies. It has similar metals that you indicate. There was no issue in my shipper getting it through. There was no tariff added. There was no certificate of analysis.