Need a script to save slices as full size images

I am trying to create a file that our team can use to create slideshows for social media. I would use artboards but the content can't easily overlap that way so it's not often fit for purpose without complex workarounds. I have a file that is all formatted with slices so it can be easily exported into multiple images by anyone on the team, but with the file size limit of the legacy Save for Web the exported images are too small.

Does anyone have a script that simply does what Save for Web does but without the file size limit? So it saves each slice as a full-sized image, ideally asking where to save them.