Philadelphus dig out or leave?

in Plants
My belle etoile is 25 years old and the base is a bit of a jumbled mess making the plant very lopsided. I can never seem to prune it to get a good shape. I'm inclined to dig it out and start again. Would love your thoughts.
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It soon sprouted again and is about 8ft now.
If you like it - give it a go and see how it responds
Wisdom is not putting it in a fruit salad.