Is it possible to disable the utf8only property on an existing dataset?

[RuRo]

I have a dataset with normalization=none and utf8only=on.

As it turns out, I do need support for non-utf8 filenames. Is it possible to disable utf8only on an existing dataset without recreating it from scratch?

zfs set utf8only=off rpool fails with cannot set property for 'rpool': 'utf8only' is readonly.

I can understand, why you can't change normalization after the fact, however I don't see why disabling utf8only can't work since utf8only=on should be a strict subset of utf8only=off.