Based on the info about transfers in the link, it does not look like it is possible to use Western Union to make a peos deposit into the account.
It looks like the government only wants DOLLARS to be transferred into the account and I have a "hunch" that WU "transfers" would be blocked by the Banco Ciudad.
How is the international transaction received?
The amount in pesos is received at the official exchange of the day on which the account is credited.
How long does it take to prove the international transfer?
If the payment instruction received indicates all the complete data of the Originator of the funds and the Beneficiary, the accreditation is automatic and within 24 hours.
What data is needed to make the transfer?
All the data of the Originator of the funds: full name, account number where the funds come from and address of the payer; and of the Beneficiary: full name and account number in which to accredit. Important: It is necessary to have the complete data, otherwise you cannot liquidate the item with credit to the client, nor return the funds abroad, until such data is completed.
What is the cost of the international transaction?*
Less than USD 30, 50% of the amount + IVA (21%)
Between USD 30 and USD 99.99 - USD 15 + IVA (21%)
Between USD 100 and 999.99 USD 25 + IVA (21%)
Between USD 1000 and 55 thousand - USD 55 + IVA (21%)
More than USD 55 thousand - 0.10% + IVA (21%)
*The 21% IVA is on the commission and not on the total transaction. Rates subject to modification, check with Banco Ciudad