is it posible toTint multi color from one material

I make robot game and want to make color customized part
so I make multiple material slot for every part
then I curios about performance and find out
every slot need 1 more draw call
I don’t know in the long run this will be a big problem
my game is not realistic and use low-middle poly part
but that still make me concern

so is it possible to make only one slot of material that can tint multicolor
to different part of the texture
my base texture is black and white
and I tint them to generate color effect
anyway to block out like block 1,1 tint with gold 2,2 tint with green etc