No and no.
Well it is doable with 2h, but the loss in str AND con is just too much. Also I tried S/S on a low rr luri champ and well....
Let's just say that character never got a high realm rank. Luri hero on the other hand does work.
my luri champ is rr6 and it roxed..
it was p/s to rr5... prettymuch unkillable 1v1
could often take 2-3 noob stealthers on at the same time
I can see absolutely no reason why a shield champ is not worth a shot, i've got one just about ready for Molvik but i'm not really in a financial situation to be paying subs atm.
I've dueled a fair few classes with it and it seems to be very solid, the only thing i can really see being a major problem that you will face in RVR is a Reaver.
Just give it a shot.