Well they already have all that information if this compatibility only extended to planes available in the marketplace w/default liveries or marketplace livery in the scheme of all the scenery being dynamically streamed it doesn’t seem like adding some very low res plane models would be terribly difficult. Don’t need to be to the same visual level as the purchased plane, and it’s understandable how it would be an impossible problem with aircraft not available in the marketplace.
I mean on their servers just pull the model of all the planes and liveries, downscale it, find a way to id them, and load it up like the rest of the scenery and stuff, and stick it in place of the generic models flying around.