Usually, current vs temp variation will not too hurt to the circuit operation. I suggest you better check the circuit rather than ask for temp independent current source
Usually, we will develope a bandgap reference. So we get a constant voltage source. Then we will use a external resistor together with the bandgap volatge to produce a constant current.
I=Vbg÷Rext. Vbg is the bandgap volatge and Rext is the external resistor.