The omni suspended over the middle of the group sounds like a good idea.

If you've got a PZM and a table in the middle of the musicians, the PZM in the middle of the table could be neat, except it might blow the cones off the speakers every time anyone dropped a jar on the table.

It will only work well if there isn't too much background noise (talking etc) in the session area itself.

Miking up everybody individually is likely to be a mess practically and a disaster musically.

Anahata