Can one attorney provide unbundled services to both spouses to save money?

No. An attorney cannot represent both spouses in a divorce, and this prohibition applies to limited scope representation just as it does to full representation. Because the spouses' interests are legally adverse, representing both creates a conflict of interest that Florida's rules do not permit, even for a narrow task. If you are using unbundled services, the attorney you hire represents only you. Your spouse would need to either represent themselves or retain their own separate counsel for any tasks where they want legal help.