Ozpilot,
It can't hurt, but I would recommend you contact your maintenance section or provider for further advice, they in turn will consult your aircraft's maintenance and service data to give you a definitive answer.
The reason nitrogen is specifically required for large aircraft is that in the event of high temperatures, temperatures that can be generated by braking action or aircraft structural fire, the nitrogen filled tire is less supportive of combustion. In smaller aircraft generating lower braking heating, or not exposed to actions like combat conditions, nitrogen might be used in order to have the wheel assembly exposed to lower moisture content- in the hopes of minimizing corrosive action on the wheel structure.
Your question about pilots servicing the aircraft tires with nitrogen is an interesting one, I was unable to find any data suggesting a verdict either way. Honestly, I would see no problem with the procedure as long as the pilots in question have been properly briefed on the procedure by licensed maintenance technicians, and the procedure is subject to proper oversight. I can see how this would be a concern if you and your aircraft were at an outlying station with no mx people present.
The important caveat to this however- consult your maintenance staff about this, and make sure you are legitimately authorized to perform this kind of procedure. It's easy to overstep the bounds of what a pilot is authorized to do versus what a licensed mechanic may do.
I'd appreciate it if you let us know what your maintenance types say in this case.
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