Hi, Roger

the simplest (component count ) is to use "classic" transistors and use resistors for 3.5v Hi state switching, and 1.5v Lo state switching ...

That gives "R1" = 10k and "R2" = 2.2 k ... and class "C" transistors ( gain > 400 ).
The original Logic transistors can't work this way due to the too high b>e resistor

AND do not forget the +V/2 pullup 2 resistors ...

BUT ... what do you want to realize ??? other solutions possible !!!

Alain