LOL, I enjoyed this thread, nice flowers
@Stickroot
you can make this design work. Going forward, if it were mine, I'd use and sprouts that happen to appear in the unbranched portion of trunk as escape sacrifice branches. One or two should be enough, lowest one should be allowed to run for many years.
Your first segment of 2 sub trunks is fine. The left subtrunk, where it divides to 2 branches, the lower left is too thick. I would remove it entirely, and chop the right side to an inch above its first branch. Thats what I would do with the right side.
Left side sub trunk, I would shorten both branches by about 1/3 rd. Each level of ramification I would keep extension shorter than the segment below it.
Basically, you have an informal broom style going. The type of broonm where it follows the 1, 2, 4, 8, 16, 32 plan. This is a common pattern followed often by many tree species, very natural looking. American elm is the classic for this pattern. Maples frequently follow this plan, though in maples, the 2 subtrunks often are much longer than the initial single trunk segment. Nice start. This tree I would finish at roughly a third taller than current.
Though if this were mine, my first impulse would have been to follow BVTF's suggestion. But I like shohin. The plan you went with will be a pleasant bonsai in maybe as little as another 5 years.
Keep it in a nursery pot, and growing rapidly until you have the 1, 2, 4, 8, 16 portion up to size. By size, I mean trunk diameter up where you want it. Don't downsize the pot until the trunk is at least 2 inches in diameter, maybe more. Let a low escape run, 6 feet would not be too long.
Nice, and I love the flower color, and foliage color.