How to Clone a Price Set Field and Its Options
Sorry - your best bet is a big pot of coffee and just getting it done via the GUI! That's because there are quite a few places in the database that are touched when storing price options. Even with phpMyAdmin access (like you have) it's going to be a lot of copying of rows - then updating IDs - carefully linking them properly to the other tables involved in Pricesets. Something is likely going to be out of place. Best to use the GUI.