For what it's worth, I'm the person who placed the (now rusty) bolt on the first pitch of Thwarthog. You are encouraged to replace it with a beefer, newer bolt in the same hole. Note, however, that on the FA, the first pitch was protected by tied off pins - the bolt was added after the FA. Here's hoping the route gets more traffic after your efforts. Thanks for the modernization!
For an easier but scarier version of Thwarthog, do the Black Wall, which is located just to the right (5.7+ R [note the good old "+" after the seven]).
Also, to the left of Pressure Drop is Blank on the Map (named for a Shipton book), which as I remember, was a pretty good route as well.