Some great weather in parts lately....
The damage probably seems a lot worse than it is. You have not given us any pics of how bad it really is but I would expect most trees to recover well.
I have not seen Chinese elms 'bleed' but I have seen them produce something like jelly when the roots are cut and kept wet. Usually when a plant weeps after damage it is just protecting itself from infection. Bleeding is usually just water and will usually stop after a couple of days without any treatment
Maple bark can be damaged badly by wiring but young trees generally grow over any damage as they thicken. Your trunks and branches may end up with some damaged spots if the hail was severe enough but as the trees are young I think it is likely you can work around any permanent damage. Either use the scars as part of the story behind the design or prune damaged parts off (when the time is right) to get improved taper and changes of direction in trunks and branches. Most inexperienced growers do not prune anywhere near enough during development so if it takes a storm to make you prune that's a good thing again.
For now only prune broken branches back to the nearest convenient bud or node. Let the trees show you what is alive and what is damaged then cut back again in a few months when you have a better understanding of the full extent of any damage.