I had about 800 hours Twottering in Indonesia – 2 crew. When I came to Europe to convert my licence for the UK ATPL, the CAA gave me an exemption for the MCC course due to this experience.
I had to get a letter from the company I flew with stating that national regulations required two crew operations, and this was accepted by the CAA.
So, if it is good enough for the CAA, one would think it should be good enough for the airlines.