B2N2, long time no see.
You can take the Twotter out of your list, there is a pilot side hatch (on all versions as far as I can remember). Take a quick peak at your last photo, you'll see the hinges just visible.
But from your post I'll take it you like the Aerostar concept, entry and exit are pilot side ONLY; I would hate to be stuck all the way on that back seat.
Gotta love planes build by pilots for pilots!
Take a look:
Ted Smith-Aerostar 600