1. If the scion is not fully dormant,i.e. the buds are breaking out a little, can the graft still take?
2. What if the buds of the scion are swelling and yellowing a bit?
Last spring I got some Asian pear scionwoods's buds swelling and the graft still took. I would recommend you graft it as soon as possible.
It can take, one time I have cut a scion when the leaves were just out slightly and it took. I babied the graft by wrapping loosely parafilm tape and shaded the graft.