So, went into the Yaskawa rabbit hole for a bit. They don't seem to have that much info readily available. And at least for the V1000 series, the 1000Hz version seems to be SW upgrade.
But from what I can tell from the one document I could find is that even for the Yaskawa V1000, you loose vector control in high frequency mode. At least that's how I read it - they seem to call it OLV - Open Loop Vector which is disabled when running the 1000Hz SW. But they still have something called Torque Compensation. Anyhow, perhaps they have more advanced VFDs that can do it.
The data sheet is here for anyone interested.
https://www.yaskawa.com/pycsearch?ke...=Entire%20Site