PCIe-6363 and BNC-2110

Hello.

I am using a PCIe-6363 with a BNC-2110 board. We are reading two digital inputs simultaneously via User1 and User2. Works great!
Now, I want to add two digital (counter?) outputs with two different frequency for modulation purpose where I can alter frequency and duty cycle.

Is this possible with the BNC-2110 board and the USER-I/O already in use?

If yes, which outputs can I use?
If no, is it possible with a different board? I think the PCIe-6363 is able to provide that.

Thanks in advance!