You can definitely send/receive payments to your bunq account from another bank account outside of the SEPA Region!
All you need to do is make sure that the sending bank converts the amount of the payment into euros before sending the payment to your bunq account. This can also be done through an intermediary bank (if the sending bank has one). We choose not make use of any intermediary bank, as we love to have our independence!
You can also use our TransferWise bunq app integration.
To sum up: You can receive payments from outside the SEPA Region if the payments are sent in euros or if the payments get converted to euros before they reach bunq. If a payment using a different currency reaches bunq, it will get bounced back automatically as we only support euros as a currency. Keep in mind that there will also be a small fee to do so. You can check out more information on our pricing page.
You can find more useful information to send the payment to your bunq account at this topic.