Is it possible to link my Syncplicity business account to my Google Drive business account?

If you setup offline access to your Google Drive data you can also add that folder to Syncplicity. Note Google's information about working with data offline, there are some limitations:

https://support.google.com/drive/answer/1628467

Using offline access for the data in Google Drive is the only method you can use Syncplicity and Google Drive on the same data.