Blake, Cole, Bryce, Chase - my preference in that order.
I know both a lovely Blake and a lovely Cole. I do know of a 30-something Australian Chase but no little ones.
Honestly OP, I genuinely don't think anyone bats an eyelash once they're being introduced to the baby, the name becomes the baby.
I don't live in the UK but live in an island near the US which has a massive mix of British/Aussie/Canadian/American/Caribbean so nobody blinks an eye at random names or names that are considered a bit "American" (like that's a bad thing?)