The easy answer is no. No one knows knows that answer. There are too many variables to tell you what is safe to mix because of current draw, and battery composition. I personally don't run any rechergables that aere not the from the same batch, and that's all I use. That whole mixing batteries is from the old school. Yes .It did spur on great innovations. That was when people before me were taking risks they were willing to accept the consequences of their own actions for.
Unless you go with a SB your best option is the three 14500's in one side of the gun.