power play - no center block back

i wanted to know if any one had any thoughts or insight replacing the offside pulling guard on a power play.

we can't have a fullback fill for the guard and our center can't block back.

if the backside guard is covered and he pulls, is it possible to have the backside tackle try to take the inside man. whether it was a 3 technique tackle or a 2i? i think all you need to do is prevent penetration.

i am also thinking that only a quick, well coached DLM would be able to chase the play inside out.

thanks