I have occasionally switched to US English but this is not quite right.
You might try Canadian English. It mostly uses -ize, but still retains -our in colour, honour, et cetera. There remain a few things that are more American than British (such as tire and aluminum), but it is probably a lot closer to what you are looking for.
You might try Canadian English. It mostly uses -ize, but still retains -our in colour, honour, et cetera. There remain a few things that are more American than British (such as tire and aluminum), but it is probably a lot closer to what you are looking for.