Hello Project Owner, Good Day to You.
After read your requirement fully, Yes, it is indeed very much possible; linking PPTX with one or more Excel workbook.
I do this every week Saturday & Sunday for our Monday client meeting. Although I can't share my official slides, I give you hint of what I do.
Our package contains slides not less than 55, sometimes more, 60 - 70, according to any adhoc requirements. Like yours, my package's contents come from various departments of our company and few from client's departments as well. Most of them say 90% of the slide contents are taken from Excel files, like Dashboards, Charts, few table contents etc.
As the content of each slide is fixed with particular Excel sheet content, only once at the first time I link the excel sheet contents with that particular slide and then voila, next time onward, the team update only the excel sheet content, which in turn I get in mail; copy paste in my Master Excel Workbook or the Excel workbooks folder and this Excel Workbooks or Master Excel file is in turn linked with my Master PPTX file, which I open, goto File menu, Links, and update each of the links and all linked slides data get updated.
As I mentioned above I will be busy in making my own presentation, which will consume 3-4 hours of my time, and Monday full day busy in client meetings, I've mentioned as 4 days time, but it can be completed even within a day or two after our mutual understanding.
Thank You// Sriram, from India.