Brusso may be a bit more than I hoped to spend (hate to be cheap, but don't anticipate this will get high usage). 

HokieKen - those are interesting (video was helpful to see how they work).  Perhaps a bit more of a challenge on install and would require a shift in design. 

Would this be sufficient?  Seems like it would be easy to install and would have the "hold open" aspect covered.  Not sure if that section that wraps into the lid would be an issue in the design.