Interesting idea. Getting data back in the MPMB sheet will prove technically difficult, if not impossible however.
The only supported way of importing data into the PDF is by importing data from another PDF, as a way of updating to a newer version. The way I extract the data from the PDF is via its XFDF data, which isn't even officialy supported.
I've experimented with feeding the XFDF data back into the sheet, but it always resulted in missing fields and other weirdness. It might be possible with a custom script for the MPMB sheet, but I have no experience with that.