As I know, you cannot disable the Location Based feature and this is annoying even for US based companies. The only workaround at this time is to set the custom rate manually

https://quickbooks.intuit.com/learn-support/en-us/help-article/set-sales-taxes/use-custom-rates-manu...

You can buy a 3rd party service to convert your data from QBO US version to QBO Global version. I would recommend these points:

1. Consider to only convert your current fiscal year to QBO Global version to lower your conversion cost.

2. Convert the rest of data to QB Desktop. You can use the trial version of QB Desktop for good to access your historical data.