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In theory, yes you could do that.

If they use an NTC, you would need to increase the resistance as it should read a lower value.
For that, you need to find the NTC and it’s value and put a matching resistor inline to the existing NTC.
If you up a resistor on top of it, it will read lower which would suggest a higher temperature to the light.

For the example of led4power’s driver, he is using a 100k NTC with a Beta of 4250K.
That thermistor has 100k Ohm @ 25°C. The beta means, it has a resistance of 22.2k at 60°C and 12.9k Ohm at 75°C
In that case, to fool the Light into thinking real 75°C is only 65°C, you would need to add a 10k resistor in series.
But please, check my calculations and if that fits for your light. Maybe they use a different NTC!

From an review, it looks like the NTC is on the MCPCB.

What you need is the value of the small resistor on the MCPCB.
After that, you put another resistor either into to thin black cable or you rotate the NTC on the pads and put the resistor there.