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Gallery using multi-images from multiple CMS elements

I don’t think this is possible but wanted to see if you can use “multi-image” images from multiple CMS collection item’s to create a gallery?

I have a client that is currently creating and uploading pictures to a CMS collection “fishing trip” and using multi-image field to upload all their pictures from that day.

The client now also wants a full gallery that shows all the pictures from “daily fishing report gallery”. The only way I can figure out to make this work is to have them upload all the pictures individually in a new CMS collection then have them reference a CMS collection (fishing trip).

Is there another way to do this without having to create 30 collection items a day?