[pkautzsch]

Any double bass? If there is one, it will probably need a spot.
I'd use at least two mics for the winds. Else they might end up quite mono-ish.
Then you have 10 mics and 8 inputs. Trouble.
You might get away with a pair of cardioid outriggers, doing the violin/winds balance by angling them more towards violins or winds.
Same could be achieved by angling the viola and cello mics, will result in closer sounding winds.
Have you ever tried 3-omni setups like Decca Tree? Set up on three separate stands, center a little lower (celli), and a spot for double bass. If you have some time to get the heights and spacings right, this will have your orchestra covered. Add a pair of harpsichord spots, and there you go. Disclaimer: Tree setups should only be done if your monitoring is good, and you either have lots of experience with that setup, or lots of time.