Ouch… Yeah, tropical hardwoods may be tough to source in the Nordics… You may have to ask around for the densest wood available. A quick dip in the Wood Database gave me a hopeful choice for you to look for: European Hornbeam. It’s not Ipe, but it looks like it’s pretty dense, and since it says it’s good for turning, I suppose it’s probably good for machining as well. And it looks moderately priced (in Europe, since it doesn’t get exported in any significant amount). But I’d rely on the expertise of local woodworkers to verify any wood selection, not some random American internet clown… 