Do you really want an unspecified number of people wandering around with OC funds, to spend at will? How many members involved; what would be the total of these funds?
Possibly, you could issue members with credit cards linked back to the OC bank account, with a limit set on individual transactions. The cards would have to be in the individual holder’s name. Any expenditure would be readily visible to your treasurer, and the card can be cancelled or restricted as necessary.
Talk to your bank about options.