I haven’t tried many aircraft in MSFS2024 yet, but I found that the TBM930 has separate click spots for opening/closing the door and entering/exiting the plane, so it already does what this thread is asking for. On the other hand, the 172 works as seen in the tech alpha, with a single “open the door + enter/exit” action.
So the good news is, the system is already capable of this, and it just needs to be implemented on a per-plane basis.