Staffing Compliance Work in C3/C4 Organizations

I am the CEO of an $18 million dollar C3 and C4 organization. Our CFO (who has worked at the organization for 25 years) is retiring in December :( We are looking to replace her and having an awfully difficult time. We are having a very hard time finding a proven CFO/CPA with experience in nonprofits and C4 compliance. The position can be remote from any place in the U.S. It seems near impossible to find a CFO who also has compliance experience but that piece is absolutely critical for us. Does anybody have recommendations? I'm starting to wonder whether other organizations have the compliance work staffed outside of the accounting function in some other way? [We do have a firm that she coordinates with since we are operating in so many states; however, she is still the person managing all their work and making sure we remain comliant with the law. ] NOTE: We are using a recruiter that specializes in non-profit searches who has conducted successful searches for us in the past. Our existing staff are very strong on the account side, so the piece I'm most worried about with her exit is the compliance expertise, investment management and overall strategic partnership. The second two pieces seem relatively easy to find in most candidates, but the compliance expertise has been truly problematic.