Most affordable way to upgrade HRC week to Portfolio?

I've been dragging my week on this, but we own a 2,000 point week at HRC San Antonio. (We normally use the points in San Antonio, Breck, Beaver Creek, and Carmel.)

As the years go by, they are making it harder and harder to book the good stuff without a portfolio account.

What's the best way to approach an upgrade? I assume an owner update is not it. Any opinions welcomed.