I'm working on that piece right now. I am using an edition by Lucas Drew (who--correctly--calls it a concerto rather than sonata). There is also supposedly an edition by Simandl, but I have never seen it. Both the Drew and the Zimmerman editions have a fair number of changes from the original oboe version, so I have been looking at the original oboe music to decide which changes I like and which I don't.
There should be a good number of recordings of the piece on oboe and I know Klaus Stoll recorded it on bass.
Here's a recording of Bartosz Sikorski (currently a member of the Vienna Philharmonic) playing the first two movements.
handel
I found that recording on
www.wolfbass.com, which also has a bunch more interesting recital recordings.