Glide ratio and best glide speed will give you Cd with a few back of envelope calcs.
Looking at my personal notes, I have data for a Quik, which is last generation but still quite high performance. That gives a glide ratio of 7.7:1 with MTOW=409kg and best glide speed of 50mph IAS. You should get something to 2ish significant figures from that.
Generation before that would be a Quantum: 8.5:1, 40mph, 390kg.
Generation before that an XL-Q: 8.7:1, 40mph, 365kg
And if you really want to go back into pre-history, Pegasus XL-R, 7.5:1, 41mph, 350kg.
That's for the whole aeroplane of course. I had data once for a few wings on a test rig, but unfortunately that's mostly buried now in a previous employers archives. Looking at the one graph I have tucked away in an old report, it really isn't good enough to tell you much. But for a wing of the same generation as the XL-Q, *indicates* Total drag below 400N in the range -10 to +20° AoA, with Total lift about 6500N at 20AoA (stall) and about 4400N at 10AoA, and zero at -5AoA (just blame the datum there). that was at 44±3kts.
G