Nice thread, time perhaps, to reanimate it.
A dear friend just sent me a copy of the “(25) Capricen für Altblockflöte Solo” by Quantz. In this edition, from Amadeus Musikverlag (BP 387), which is quite reasonably priced, the pieces have been transposed to fit the treble recorder. Great fun to play, they sound more difficult than they perhaps are, though there are still plenty of challenges (for me, at least). My recommendation, start with No. 6.