in reply to Re^3: Tk and native controls do not play along on Windowsin thread Tk and native controls do not play along on Windows
I imagine it wouldn't be a quick move from Tk to Wx for that length of program. BrowserUK's approach does look like the winner for you.
DejaVu Sans Mono
Droid Sans Mono
Envy Code R
Source Code Pro
The default, whatever it is
Results (355 votes). Check out past polls.