There are situations where you can use a quick trim reset to zero instead of having to click through to do it. Take off checklist being #1, easy to reset to zero then set to the desired position. Pita if it’s been set to some large +/- number intentionally or accidentally.
I didn‘t think of the large jets, yup… but don‘t they have working trim indications?
Rudder trim is the only one wich can be bind directly in MSFS to a reset function:
controls options/flight control surfaces/control trimming surfaces/reset rudder trim
But you can send commands via SimConnect. I do it with my StreamDeck for ailerons.
Events are:
ELEVATOR_TRIM_SET with param [0]
AILERON_TRIM_SET with param [0]
RUDDER_TRIM_RESET (no param)
or
RUDDER_TRIM_SET with param [0]
Is it possible to re center the nose wheel steering axis used for thePMDG 737 via this function as it is connected to the rudder function?
I don’t own the PMDG 737 so I don’t know.
But these events are for TRIM reset.
You should have a look here:
https://docs.flightsimulator.com/html/Programming_Tools/Event_IDs/Aircraft_Flight_Control_Events.htm#AXIS_SPOILER_SET
Scroll to the RUDDER section for available events.
Perhaps “AXIS_RUDDER_SET” or “RUDDER_CENTER” or “RUDDER_SET” .
You’ll have to test them by yourself.
A bit of personal work is never a waste of time… 
Edit: there is a Nose Wheel Steering section here:
https://docs.flightsimulator.com/html/Programming_Tools/Event_IDs/Aircraft_Misc_Events.htm
Perhaps these events are those you’re looking for ?