Non Euro payments in ISO 20022 XML format

We are still on EBS version 11.5.10.2 and are using the seeded localization "Swedish Bankgiro Inland". Next year the banks will not accept payment files in the Bankgiro format. They want our payments in the "ISO 20022 XML" format. SEPA is such a format but in 11i it only works for the Euro currency. So we are planning to do a customization that creates a payment file in the "ISO 20022 XML" format. Has anyone done such a customization or has knowledge about the mapping between the payment database columns and the XML tags in the "ISO 20022 XML" format.