I believe Proton Wira have the lowest seating among all those models you have listed above.

Personally I think Persona should have the highest seating among these list + tall headroom even at rear seat.

The driver seat is adjustable so it can be lifted as well, being tall driver, the seat immediate to your back will have small leg room due to Persona came with really wide seat that support your thigh for all passengers.

Some car have visually spacious leg room because they shortened the seat, imagine 10cm short in front + back seat will give u extra 20cm in leg room.

Oh sorry to confuse you, the lifting have nothing to do with leg room at the rear,

Because the nature of you being tall you will adjust the seat backward which somehow reduces legroom for back seat.
I believe Persona should be no.1 or no.2 in your list to have smallest leg room for rear seat.

Front seat lifted or not, the rear passenger still can tuck their feet under the seat unless they wore tall shoes, then raising the seat gives a bit more room.

If you are fine living without reverse camera, only 2 pcs speakers, physical key, non-fold rear seat & non touchscreen radio, you may go for standard.
Anyway the headunit, speaker & reverse camera can be added later probably within RM2k

Personally I would either take Standard or Premium because mid spec price Vs full spec only 5k, I would rather get full if I can afford exec.

For 2nd hand I think Standard would do just well, because premium of that time may not have that much of wow factor compare to current offering.

All you need to do is budget about RM2k for a better headunit with Android Auto/Carplay, speaker upgrade and reverse camera installation.