How to create and send individual PDFs for many signatures from MS Word mail merge?

We use a MS Word doc (mail merge tool) that references a MS Excel sheet to insert pertinent data (in our case, names, investment amount, and equity %) in a specific table structure  into a mass PDF with usually with a hundred or so pages (each page with a different name) for legal purposes, each person needs to sign their respective investment amount. We then separate out using Acrobat, save each individual file as a separate PDF, then use the 'send for signature' on adobe acrobate. As you can imagine, it takes a lot of time to send hundreds of these signatures and becomes quite tedious. Is there a way to simplify this process? Thank you so much in advance, we are drowning from this and really need some help...