dpb wrote:
....
... Even if you could eventually retrain it ...

And, as someone else pointed out, a redbud isn't that unusual of a
specimen nor costly planting, has a (relatively) short lifespan and
unless you go to great difficulty in making a sling of sufficient
strength and size to use around the branches where you're pulling, the
cable will just act as a saw and cut through them w/ time effectively
girdling it rather than bending such a large branch, anyway...

All in all, pruning or a new specimen are your only (realistic) options
in all likelihood.

--