The CB500X is certainly a US model, and has been since 2013... the person you spoke to doesn't know what they are talking about.
Any Honda dealer in the USA can order any parts you need, and most service consumables will be in stock (certainly oil & filters, and almost certainly brake pads too - you might need to order an air-filter a few days ahead)... likewise there are any number of tyres you can fit to these size wheels, and larger dealers (of any brand, or even Cyclegear) ought to have something in stock which will fit too.
Also, fwiw. 10,000 miles per month is a LOT of miles, even in a country the size of the United States... Perhaps consider what it is you really want to see (rather than have everything flash by in a blur) and slow down a bit - there are some fantastic places to actually spend time in in the USA.
Jx
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