Getting Google Spreadsheet default locale to work correctly

Here is my issue :

• We work in English
• We are a French company : we want Euro as default currency...
• ... and the "French formatting" for dates (dd/mm/yyyy) and numbers (1 thousand = 1 000,00 ; not 1,000.00).
.. Which is by the way, the standard in continental Europe if I am correct.

I cannot get the default language and country to work correctly :

• I set defaults that should work (language = English, country = whatever country in continental Europe) in : myaccount / language (as found on Google support page)
• ... But when I create a new Spreadsheet (from Drive> new spreadsheet) it is created as "locale = UK" (hence currency is £/GBP, I want Euro). And this is for every country in continental Europe... 
The only country that is not switched to UK is Ireland, but the numbers formatting is not what I want (problem with comas ",").

This matters because as comas are not used similarly, it is "a small pain every time we copy/paste figures", same with dates. Hence we change every single new document's locale.1 min on almost every new Spreadsheet to understand why your formulas don't work and manually correct, this is irritating!

For references, I have looked at these pages that don't address this specific problem:

• Change Google Sheets default date format with other locale
• Setting up decimal separator, thousand separator and date in Google Spreadsheets
• How does one set the default locale for each new spreedsheet in Google Sheets?