Sharp and interesting, ha.
It can happen:
http://www.chess.com/forum/view/chess-openings/sharp-english-slav
That's not even a Reti.
Of course it is. There are quite a few ways to transpose to this system that don't involve playing Nf3 on the first move.
I'm an ex-english/reti player. Those games are slow and boring. I used to play them because I get to 'skip' alot of theory - but it yields very dull games.
I figured if I'm not having fun playing it - why play it? I play chess for fun. ;)