Discussions about this issue have been going on for a while now in de.wikipedia. Like in en.wikipedia there is a page where blocked users can appeal their block, namely Wikipedia:Sperrprüfung. Recently, procedures were changed in a way so that users can use their main account to appeal their block, which requires full unblocking of the blocked account and which did not work that well in every case.
The idea behind this proposal is that a new blocking option will be introduced which allows blocked users to edit the concerned wiki's page for block appealing, similar to the option "can edit his or her own talk page".
Duplicate of T18447: Software should allow blocks that only expire when a user has read a specified page (training module, user talk page, etc.)
See also T240311: Partial Block UI: White-list of pages allowed to edit for site-wide blocks