No
AS F1 2020, we can use FOM car to an real team, but we cant use real car to MyTeam.
The reason is simple, FOM car have more than a model, like all the scene for all department. Real car havent it, because on a driver career you dont have acces to this feature, its belong to MyTeam. So thats a problem.
And if possible... you cant have any ''liveries''. The UV mapping of real car is so simple, i mean on a 512x512, like for a Ferrari the red of the car will be fitting on a 1x1 square on the 512x512 somewhere and only the ''design'' will be fit on the 512x512.
And for steering wheel, to be honest i dunno but probably hard to do