There is no way I know of to change a space key. The name can be changed, but the key stays fixed troughout the life of the space. You are correct that the only way to "change" the space key would be to copy the space to a new space with the desired key.
You can use this to change the space key.
Copy the space with this plugin. While copying the space you'll be prompted to type in the name of the space and space key. After changing those, export the space you copied with the new space key and import it to the confluence instance you want.
Download the Copy Space for Confluence plugin and install it
For manual installation;
Administration > Global configuration > Manage add-ons > Upload add-on > browse (select the jar file you downloaded) > Upload
To use plugin;
Spaces > Space directory > click on the space you want > Space tools > Apps > type in new space name and key( you can check the boxes to copy the options specified > Save
Your Space Directory should have your copied space with the new name and space key.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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