Hi Jason,
DBXL v2.3 needs to "own" the xsn. You attach the template to the DBXL Administration Tool and it gets accessed via that path you discovered (shown in the DAT General tab).
You can then add database and SharePoint mappings. However, DBXL still "owns" the xsn. DBXL can publish that XSN to a form library (or two, or three, depending on your license) by using the SharePoint tab. With DBXL v2.3 you cannot take the XSN and put it in a Sharepoint library (or publish it) manually; again, DBXL needs to control that.
If you have <x> number of form templates that do not need database mapping, then just publish them to SharePoint and you're done (I don't think DBXL needs to be involved in those scenarios). For the templates that need SQL (database) mapping, add those to DBXL and then add the necessary SharePoint mapping.
DBXL v2.3 has a free trial, so you could try all this out without having to purchase anything, to see if it fits your requirements.
Does this address your question? Let me know if you have any other questions.
Thank you.