Graft got to heal before it drys out. Even late febuary would be a dead duck here in NY. See the buds getting big or better yet mouse ear leaves, that when to do it.
Should be good if put in a fridge now till then. Not sure about pears, but you can T-bud in the summer on apple trees.
Got trees at home? Park some of them on your home trees, got plenty for next year.