Posted in a different group, but yes, someone has succeeded in getting it converted. I will post the thread for your benefit. If you have more questions join the group. and you may query the original poster. ;)
90-day tourist? Check your visa stamp under TYPE. If it says STV, it is impossible to convert to non-b/ED. The only thing you can do is apply for an extension of 90 days.
That would still be needed before the embassy would issue a COE for the traveler. From what I read on this update, the only change is a reduction in quarantine time for vaccinated travelers, and no F2F needed. Everything else appears to be the same.