Is it possible to transmit Midi and ps/2 data with one USB port?

I'm using a mega2560 I also have a FTDI

I am working on a midi controller and would like to incorporate a PC keyboard into it

Is it possible to transmit at the baud rates for both through one usb cable?

I was thinking of maybe switching the serial speed for each called function.
I'm not sure how possible or ideal this maybe though

I suppose you could. Each receiver would see invalid data when it's data rate was mismatched.

I would only need the keyboard data to be transmitted to the PC so there wouldn't be any input

so im thinking i should be able to set the serial speed back to 31250 after every keyboard function