Straightening a Prunus?

I recently purchased a discount prunus amanogawa and it is a little bent over at the top.
Do I give it a year or two to see if those bits straighten up as it grows or do I cut my losses and prune them off in the summer next year?
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It might straighten up as it heads for the light but maybe you could encourage it with a cane or post and a gentle tether.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I'd thought of that but it is already 2.5m tall. I have been trying to work out how to straighten up such a big one!
There are tall canes available or posts. If you prune the tip you'll end up making it branch and that may spoil the shape even more.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw