pruning:
Natural habit of high bush types is to send up a shoot from the roots. First year it is a tall whip without branching at all. normally the terminal bud dies over winter. 2nd year branching begins, usually the cane will arch over somewhat. Over the second winter the branches on the underside of the arching stem tend to die, Often main branch will die past an upper branch. Side and upper branches form flower buds. Again, most terminal buds on branches die, and the 3rd year extension is from buds further back on the branch, and on the upper side of the branch. 3rd sprimg the flowers bloom, and summer will bring fruit. Mason bees (a native solitary bee) and Bumble bees are best pollinators, honey bees are only 50% effective. Northern highbush are self fertile, some lowbush are not, I don't know about rabbit eye types fertility.
so to keep branches from dying off, none of the branches canbe shaded relative to the others. Bending a branch below horizontal is likely to last one or two seasons, then the branch will expire in favor of a more vertical branch. Cascades are not likely to work. While a branch may live 20 years, it will be difficult to keep fine ramification past 4 or 5 seasons. Fine twigs are sacrificed to a strong bud elsewhere on a branch.
all this said, Blueberry do make cool bonsai, you need to plan for this succession of branches, Style will be one of constant renewal. Fruit will happen on branches from 3 to maybe 6 years old, then that branch will abort in favor of youner buds and branches.
flowers, fruit, Autmn leaves, interesting nebari, eventually rough shredded bark on older parts, all make for interesting bonsai or kusamono. I am a fan of using blueberry for bonsai, but it is different from your average trident maple. No styling will be 'permanent', but the nebari will get larger and larger over time.
have fun
the curious habit of aborting terminal buds and branches on underside of main branch needs to be planned for. If a branch on the top side of the cane gets some size to it, often the main branch will die in favor of the upper branch. You end up with arching branches with repeated climbing curves. A branch can live a decade or two, but ramification may be difficult to retain.