You're not alone in that concern. The US used to make all sorts of high-end tech stuff. Not anymore. Since I gave up on Chinese ESCs (which would actually work in your case), I've sourced stuff from Australia, the Czech Republic and Germany. Heck, Ireland's tech sector is probably stronger per capita then the US. In any event, we're happy to help you make this thing (at your own risk, course). You have some significant advantanges over a car application:
1. Low power requirements
2. Compact install - I'm running almost 20 feet of cable to fit this in the car in a way that's not obtrusive.
3. Because of #1 & #2, all the parts and stuff required are exponentially cheaper.
I'd suggest sourcing an appropriate compressor first, and working from there. Something along these lines:
https://duryeatechnologies.com/duryea-electric-supercharger/ I have no idea how much that costs, but in this case, it's very similar to this supercharger:
You can get them for $200 USD or less. And you wouldn't need a crazy high rpm motor either.
BTW - LOVED the interview an RTE reported did with the russian ambassador to Ireland. I have a good friend from Donegal. Thanks to all of Ireland for the support of Ukraine!