I'm sorry, I don't know what a hackers keyboard is. On Nexus you can ask for different language keyboards to be available. I have asked for the Greek Alphabet keyboard on which are 8 'vowel' letters, any one of which may require a stress mark. On a normal PC when using a Greek alpha keyboard the apostrophe (not used in Greek) is used before a 'vowel' to add the stress mark. Any further thoughts would be very useful