If you don't find anything suitable you could have one made. I needed a profile for a job to match existing trim. Not to be found anywhere. I ended up getting a custom bit made by Ridge Carbide. It was a a fairly large router bit .................... came in at $300 (carbide). Sent them a sample of the trim. Got a perfect match. Typically you will here about custom shaper cutters, but custom router bits are available too. Yes, pretty expensive but if you use it a lot it may be worth doing.
Seth