No that's not a good idea sorry, because screenshot print the time on your computer, which can vary depending on your timezone, and which can be altered if you wish to ^_^;
MVP respawn time will be official, it is very possible that no one might get a mvp card and that challenge be left uncompleted or that only 1-2 people get the equips they want from mvp. Either you hurry to try and do the mvp first, or you plan other gears.
No special case for TK, sorry, but you can be the first to hit 99.
