Ok continue crying lol.
"For extended periods" ya okay. You need to USE the phone for a few days.
So just buy the latest iPod touch if you need the latest 4" display.
How many times do I have to say it. Phones over 4 inches are not for everyone. I do not want a phone I can't use 1 handed. Unless you think that buy using the iPhone 6 for a few days will shrink the display so I can use it 1 handed, its a stupid suggestion.
I've tried android based 4.5-5 inch phones for extended test periods and I hated the size. End of story.
An iPod touch is not a substitute for na iPhone and the iPod touch 5 is A5 based outdated.
Nothing wrong with giving the consumers the choice to choose a 4 inch phone with the latest specs.