[GNC] Investment Portfolio Reporting

[rsbrux]

I need some reports which show the performance of various investment 
accounts over the past year.  I don't find anything suitable in GC 
2.6.19 and don't have the chops (neither in accounting nor in guile) to 
write my own.  Surely I am not the first GC user with this need.  The 
only thing I found which looks useful is gnucash-portfolio:

http://portfolio.alensiljak.tk/

https://github.com/MisterY/gnucash-portfolio

However, as ignorant as I am about Python, I am not even sure how to 
install it.  Furthermore, it appears to require the GC DB stored in 
SQLite, whereas mine is still in (compressed) XML.

Does anyone have experience with gnucash-portfolio?

What other approach could I use?