Change PPA key uid

Hi,

We've created a PPA and chosen a display name of "Test PPA" thinking that we could change it later on.
It turns out that we can change the display name, but the uid still displays "Test PPA".

Is it possible for our uid to be renamed to "Τεχνική Στήριξη ΣΕΠΕΗΥ", to match the display name of our PPA?
PPA: https://launchpad.net/~ts.sch.gr/+archive/ppa
uid: http://keyserver.ubuntu.com:11371/pks/lookup?op=vindex&search=0x3C72607B03AFA832

People are not yet using our PPA, they will start using it in a week from now. So we don't mind if something (e.g. the key) needs to be deleted and recreated in order to get rid of the "Test PPA" name.

Kind regards,
Alkis Georgopoulos