Twin trunk windswept style bougainvillea

I bought this bougainvillea from a garden centre 2 years ago. It is still in a training pot after reducing the root ball.
I'm training this in the windswept style, my first time ever of trying this style. It is an unusual bonsai as it is a
combination of 2 styles.
It has a problem of reverse taper of the lower trunk. I'm planning to correct this by air-layering the trunk just
below the low growth on the right hand side.

Height 35 cm Trunk diameter 6 cm.

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