Thousands separator in monetary unit input field

Certain currencies frequently transact in excessively large denominations either due to historical or present-day hyperinflation, automatically adding a thousands separator in user value input field will be very helpful visually. I've to caution that, however, the symbol used for a thousands separator varies by region (in effect, language) like a decimal separator.

Objectively, the most inclusive character for a thousands separator is a whitespace. This is preferred by European Union interinstitutional style guide, see: https://publications.europa.eu/code/en/en-370303.htm