IDNs exist in two forms, the Unicode version and the version encrypted in ASCII (starting with “xn--”) known as ACE. It is more than likely that even if your Registrar does not accept an IDN in Unicode form, there will be no problem using the same IDN in encrypted form. Afnic provides an IDN conversion tool on its website that provides a ‘simple’ response to this problem. However, if your Registrar does not offer IDN registration at all, you can transfer your domain name to another Registrar that does offer this service and request the IDN version as soon as the transfer is completed.