Rounding Invoice total after VAT - localisation available?

We are integrating our Swedish company, where they round the invoice total after VAT. For both Sweden and Norway it is common business to round the invoice total to customers.Both currencies SEK and NOK are defined in two decimals, used in detail lines, pricing, discounts, etc. On the invoice the total after VAT is rounded to the nearest whole number, where the rounded amount is shown and financially booked to a specific account.

Is there a localisation available or any suggestions in which direction a (simple) solution can be realised?

thanks in advance