You should be able to find a number that will stay quite small. But don't look for them at a box store or similar. The best selection will be at a decent nursery that carries a variety. Many of the weeping laceleaf forms will stay at that height or less but make sure they have a low graft and are not being trained to extend vertically. Other choices could include Baby Ghost, Beni Hoshi (Ruby Stars), Mikawa Yatsubusa, Pixie, Shaina, Rhode Island Red.

If being grown long term in a container, that has a naturally dwarfing effect. so even larger growing JM's could work. But be advised that containerized trees take a certain amount of care and attention that inground trees do not.

02ish I bought a house with a couple foot tall laceleaf style acer palmatum. It is almost as tall as me now but probably a bit wider than you want, so think in the 3rd dimension of width.

Also lets think 4th dimension, time. If you find a tree you love and it will be right for your deck for deckade (see what I did?) then go for it. In a decade you or a neighbor or relatice will have a specimen to plant in ground that just may make it, but at least you'll have enjoyed it for a decade.

Sorry to hear about the damage.

A pic could not hurt.

Otherwise I'd probably wait till May and do the trimming.

I have seen trees really pull through but on their own time.

its kind of hard to see from the picture. Start at the trunk where the burlap wrap is and trace it upward, though the dead branch kind of gets lost. I dont suspect the whole tree will die, but it’s very lopsided without that branch. I’m mostly wondering if it will ever even out on that side.