We’re a small team – can an individual serve as both a planner and content developer for our accredited CE activity?

Yes (this is common), but make sure you have disclosures and mitigation strategies prepared for each respective role.  Faculty members who have relevant financial relationships with ineligible companies will require different processes to mitigate their roles as planners (e.g., peer review of their planning decisions) and content developers (e.g., an independent content review by a trained reviewer).