Hello there! I am Elisa and I have a free newsletter. I am following, because I’d be interested in the same feature too.
I understand the workaround @ahudavert suggested, but it requires a lot of work and attention. It would be nice if we could just copy and paste our latest newsletter into the same template every month (workaround anyway, but much time effective), but apparently copying a whole set of blocks doesn’t work.
I’m trying some other way and will keep you updated. Just let us know if you manage to add a new setting to solve this issue! 
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