The solution was probably not the most elegant, but my approaching headache suggested that I should take the easy route :)
Here are the relevant parts of the main program:
Code:
snip...
class Config:
snip...
sum_md5='/usr/bin/startup-manager-md5.sh'
md5_file='/tmp/grub_password_line'
snip...
class SumGui:
snip...
def on_update_password_button_clicked(self,
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