How can I setup and use a PostgreSQL database without installing a driver?

I have a portable PostgreSQL database that runs perfectly on my computer as a database server. This is a work computer that I use for a lot of work in Excel with non-sensitive data (that is, data that is visible to anyone on the LAN). Having access to a fast database server would make my life much easier, however, I need to be able to write to it using either VBA/VBS/Powershell or .NET. I can't install the ODBC driver for the database as that requires administrator privileges and I don't have a great relationship with the IT staff, so they would reject any request without even reading it. Is there a way of inserting data quickly into PostgreSQL (or any other fast database server) without installing the driver? I'm thinking of something that functions as a portable driver. Since the database is run with only my privileges and I can insert into it directly form the command line, I am hoping there might some way of doing this from VBA.