@Olly *****
The last day they are selling the 60 day extension of stay based on unable to travel due to COVID-19 is September 27. It is NOT used as a substitute for a long-term visa.
At most immigration offices, you must take a 30 day extension of stay based on tourism before they would sell you a 60 day extension of stay based on unable to travel due to COVID-19.
You would not have enough time to go on a 60 day extension of stay based on unable to travel due to COVID-19