Yes I am aware of that solution. I should have clarified the goal of the exercise. I’m trying to work out if I can make an easily interoperable system where a singlemode fiber wall jack fed from a 40G switch can act as a both a 10G or 40G port as needed. I am using singlemode as I want to avoid using MTP multimode cable seeing how much more expensive it is than simple lc-lc singlemode.