Global Find/Replace for a source web block


I have an espace with over 50 web screens. They all use Common\Footer web block. I want to change all the screens to use a Footer from a referenced espace. I don't seem to be able to do a global find/replace for web blocks. So it looks like i have to go to every page's footer and manually change it.

Is there a better way?

Thank you very much.
At first sight, a replace doesn't seem possible.
Is the current footer one you created yourself? If so, an option would be to remove the content and replace it by referencing the new footer. That way, you won't have to change it on every page I think.
Hi Fabian,

Have you tried this?

Tiago Simões
Also had this in mind but the replace all was disabled. I'll try again.
Thank you both for your tips.

Tiago's tip worked.