Looks like a nice base, the hollow where you can see through to the other side is pretty rad. In gerneral Hawthorns don’t heal scars very well, and any substantial trunk chop like the one this will need you can pretty much count on it never healing. Which is totally fine. I may be wrong, we’ll see when BVF chimes in, but I don’t think the chop on his famous little hip hawthorn ever healed fully.
If anything I think massive wounds/scar/hollows on hawthorn are more than appropriate. Hawthorns are pretty closely related to Apple trees. If you find old hawthorns or old apples in nature you will often find that the trunks of the tree can be completely hollow and have been for decades but the tree lives on. In my opinion to have a scareless hawthorn would be suggestive of a very young tree and not be very interesting to look at. You could always hollow out the trunk around where you make the chop. I think embracing deadwood characteristics is definitely the way to go with collected hawthorn.