Nice.. I love Hawthorns.. when they are healthy they just EXPLODE growth.
With a stump of this size and the resulting wound of your first prune (If you decide to do so), I would think that one of the main difficulties you will experience, other than the wound itself (just pick a front and angle your prune to hide it, once again IF this is what you decide to do
) will be the transition from the meatier trunk into the new leader/new trunkline.. and it will resemble... a hangnail for a number of years until things “even out” (I would think.. could be WAY wrong)...
So if it were ME... I would make a plan and perpetuate my first “moves” to set me up for success this upcoming spring.
But after looking harder... this trunk has enough elegantly light movement that your initial prune would’nt even need to be too severe... just (in this theoretical plan) down to that top right cluster of branches in the second picture, not much off the top at all.. but essentially making a very light reduction and REcutting for aesthetics.. this is an option (once again.. not sure if what I’m saying is even a good idea
)
Buuut if it were mine... I’d prune LOWER.. I’d prune now... and i’d prune to hide the wound.. (but once again.. I tend to insight tomfoolery)
Nice tree! I’m a jealousy-filled doughnut.