Don’t think Harrow sweet will be that hard to keep at that height regardless of how you prune it. Drippin honey won’t like being kept that short but it can be done. Here is a place to start When Pruning Pears theres a lot to learn - Brindilla, Tira savia, Chicken Paw to name a few terms . I’m likely the worst person to tell you how to keep pears short as I prefer fill sized pears for most of my orchard. @alan mentioned this article in that thread http://www.goodfruit.com/the-1-2-3-rule-of-pruning/ which demonstrates pruning techniques widely used. For the moment it will be a central leader then you can decide after they get a little larger.