If you have already been using the maestro plugin to trigger the workflows you can use it again to extract the values or perhaps try the Satellite plugin.
I’ve used both plugins extensively recently in a project that required repeating groups within reusable elements to speak to the page, as well as other repeating groups in other reusable elements and it works well.
I don’t know off hand exactly which method would work best for you but, I believe with the Satellite plugin you’d want to put an antenna on your page and a satellite into the repeating group so that the repeating group cell can send the data to the antenna on the page.
I also do think that perhaps the listshifter plugin would help as well. It might be possible to put the list shifter element into the repeating group to do the calculations and then use the satellite plugin to send those values from the RG cell to the page.
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