Having the same problem here - just picked up a hub in the US and doesn’t work with any UK devices. I suppose I should have checked first!
“Each frequency would require its own radio” - I cracked the hub open and the zwave chip they use (ZM4101AA-CME3) seems to be compatible with all z wave frequencies according to the datasheet: http://www.fulldatasheet.com/m/sigma-designs-inc/zm4101aa-cme3/view
So I’m guessing smarthings could flip the bit in the firmware and make this work. The aerial might not be the right length, but it’d be better than the brick I currently have. I’d be happy to test out beta software here.
This thread seems to imply this won’t be happening: Smartthings and Europea Zwave?