Copy grouped repeater content from language A to language B

[AIC-BV]

We are interested in paying for work - if we can get a quote & invoice:

We want to be able to copy blocks (grouped repeater content) from one language to another so we don't have to rebuild the blocks manually. I'm not using wn-blocks-plugin - because it didn't exist yet - and I don't know if it even has that feature, and I cannot do the switch because the website is too big with too much content.

For example, I have these blocks in Dutch:

And I want to copy them somehow to French (for example with a button next to the language button):

That way we don't have to manually rebuild the structure of the blog, but only translate the contents which will be a huge time saver.
Example of a blog page: https://www.maatkastenonline.be/en/our-closets/bespoke-wardrobe