I just had a chance to test it for myself. On my PC, attached mode crashes when trying to initialize the capturing method. I believe this happens because RECentral uses the same capturing method as we do. Desktop mode works fine, but since neither desktop nor attached mode is rendered inside RECentral, but rather on the outside, I think that those two modes would not at all work for your use case..?
I hope to be able to make the 'Internal' mode work for RECentral someday, but this is far from a priority & it seems to work just fine with other streaming applications.