"Inverse" current mirror
(Updated to show 2 output currents, since it seems like that might be what you need.)

Here's what I was thinking assuming my understanding of the problem is correct.  (Specific components and values are just the editor defaults, you shouldn't necessarily use those depending on your other requirements.)

You have an NPN current mirror that takes a current sourced by something, and duplicates that current as a current source.  

The emitter degeneration resistors help with transistors that aren't perfectly matched.  

Of course if you can find matched pairs the circuit would work better.  High beta is best to avoid base current errors, or you could explore FETs to eliminate base current errors.







simulate this circuit &ndash; Schematic created using CircuitLab