Take a look at this
Porsche Headlight Retrofit [from CAD, prototyping to finish)
This is the best way to fix this problem but there is cost and work involved. I have these headlights and will never go back.
Also note that you could replace both headlights with used halogens for around $500. They are available on Ebay and the Marketplace here.
Welcome to the Boxster Club!
John