Anderson and Ridgeway on the edges against the run would be great but in any passing situation they'll move inside to DT to rush the passer. We definitely don't want Sheard playing primarily at OLB in a 4-3 defense. We need coverage guys at OLB. Even Simon playing SAM in this type of defense is questionable. Sheard is about the perfect prototypical size for DE in a 4-3 front.
However, and here is the caveat, if they're truly trying to recreate the Seattle defense then yes, Anderson and Ridgeway would fit in better at DE. As someone posted in another thread, Pete Carroll's defense has been described (by Carroll himself) as a 4-3 defense but with 3-4 personnel ....at least on the strong side of the formation. On the weakside I think they still use a more prototypical 4-3 edge rusher.
If we do wind up trying to duplicate Seattle, then I think the DL would be:
LDE - Anderson LDT - Woods RDT - Hankins RDE - Sheard
So ultimately to answer your question about whether that is going to happen to us, we don't know yet.