The controlling terminal should be ok for keyboard input.
If it is not sufficient, it is trivial to make a daemon that reads from serial 
and writes keyboard event to a uinput dev file that it opens.
The advantage of using a uinput is that the kernel will automatically converge 
all keyboard input to the keyboard driver.
There is no reason to mess with gtk.
For better reference look at: 
http://www.einfochips.com/download/dash_jan_tip.pdf

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