Multiple ships
I just thought of a way it might be possible to own multiple ships. i am no modder so don't expect me to do anything.
But if you make a base somewhere that can be counted as yours and have it sell only the starting fighter. if you sell your ship there it will remember and have it there again untill you buy it back.
Now make the station sell ships for nothing. so you can buy a ship some where else and sell it to this base and pick up another that you put there earlier.
I'm not sure if tis is possible but it might be woth a try
But if you make a base somewhere that can be counted as yours and have it sell only the starting fighter. if you sell your ship there it will remember and have it there again untill you buy it back.
Now make the station sell ships for nothing. so you can buy a ship some where else and sell it to this base and pick up another that you put there earlier.
I'm not sure if tis is possible but it might be woth a try