Temperature adjustment at insertion

Hello,
unfortunatly, I didn't find a good answer for this problem.
Is it possible to assign a temperature, when an particle is created.
Im trying to simulate the temperatur transition of two diffenent particletypes, while they are mixed. Therefore, the "fix heat/gran" command is not usable.
I know, that it ist possible to assign a velocity, but I wasn't lucky, searching for it.
It might be done with the set "region xy temperature T" command. But thats not a satisfactory solution.

I hope someone can help me.

Thanks
RobertG